NEET Chemistry Hydrocarbons Question Bank

done Question - Assertion and Reason

Question Bank
  • question_answer1)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: 1-Butene on reaction with \[HBr\] in the presence of a peroxide produces 1-bromo-butane.
    Reason: It involves the free radical mechanism. [IIT-JEE (Screening) 2000]

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer2)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Addition of \[B{{r}_{2}}\] to 1-butene gives two optical isomers.
    Reason: The product contains one asymmetric carbon. [IIT 1998]

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer3)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Cyclobutane is less stable than cyclopentane
    Reason: Presence of bent bonds causes ?loss of orbital overlap?. [AIIMS 1996]

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer4)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Pyrrole is an aromatic heterocyclic compound.
    Reason: It has a cyclic, delocalised \[6\pi \] electrons. [AIIMS 1995]

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer5)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: \[C{{H}_{4}}\] does not react with \[C{{l}_{2}}\] in dark.
    Reason: Chlorination of \[C{{H}_{4}}\]takes place in sunlight. [AIIMS 2001]

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer6)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Alkyl benzene is not prepared by Friedel-Crafts alkylation of benzene.
    Reason: Alkyl halides are less reactive than acyl halides. [AIIMS 2003]

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer7)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: 2 Bromobutane on reaction with sodium ethoxide in ethanol gives 1 butene as a major product. [AIIMS 2004]
    Reason: 1 Butene is more stable than 2 butene.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer8)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Styrene on reaction with \[HBr\] gives 2-bromo-2- phenyl-ethane.
    Reason: Benzyl radical is more stable than alkyl radical. [AIIMS 2004]

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer9)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Melting point of n-butane is higher than propane.
    Reason: It is called oscillation effect.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer10)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Iodination of alkanes is reversible.
    Reason: Iodination is carried out in presence of iodic acid.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer11)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Isobutane on oxidation with \[KMn{{O}_{4}}\] gives tert-butyl alcohol.
    Reason: Oxidising agents have no effect on alkanes.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer12)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Halogenation of alkanes is catalysed by tetraethyl lead.
    Reason: Halogenation proceeds through free radical mechanism.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer13)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Neopentane forms only one monosubstituted compound.
    Reason: Neopentane has high bond energy.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer14)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Freezing point of neopentane is more than n-pentane.
    Reason: Increase in Van der Waals forces increases freezing point.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer15)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Knocking lowers the efficiency of the engine.
    Reason: Fuel with minimum knocking property is preferred.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer16)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: The presence of \[A{{g}^{+}}\] enhances the solubility of alkenes in water.
    Reason: Alkenes are weakly polar in nature.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer17)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: 2 Butanol on heating with \[{{H}_{2}}S{{O}_{4}}\] gives 1 butene and 2 butene.
    Reason: Dehydration of 2 butanol follows saytzeff rule.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer18)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Ethene on treating with \[B{{r}_{2}}\] in presence of \[NaCl\] forms \[C{{H}_{2}}ClC{{H}_{2}}Br\] and \[C{{H}_{2}}Br-C{{H}_{2}}-Br\].
    Reason: This addition involves the formation of free radicals.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer19)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Straight chain alkanes have very low octane number.
    Reason: Quality of gasoline is measured in terms of octane number.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer20)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Corey-House reaction can be used to prepare both symmetrical and unsymmetrical alkanes.
    Reason: The reaction involves the interaction between lithium dialkyl copper with an alkyl halide both of which may contain even or odd number of carbon atoms.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer21)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: All the hydrogen atoms in \[C{{H}_{2}}=C=C{{H}_{2}}\] lie in one plane.
    Reason: All the carbon atoms in it are \[s{{p}^{2}}\] hybridized.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer22)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Propene reacts with \[HBr\] in presence of benzoyl peroxide to yield 2-bromopropane.
    Reason: In presence of peroxide, the addition of \[HBr\] to propene follows ionic mechanism.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer23)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Acetylene reacts with sodamide to evolve \[{{H}_{2}}\] gas.
    Reason: Acetylene is a weaker acid than ammonia.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer24)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Aryl halides are less reactive towards substitution of halogen atom.
    Reason: Halogens are \[o,p-\]directing in nature.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer25)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Benzene is a solvent for the Friedel Craft?s alkylation of bromobenzene.
    Reason: Friedel Craft?s reaction is used to introduced on alkyl or acyl group in benzene nucleus.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer26)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Benzene removes a butter stain from a table cloth.
    Reason: Butter has an affinity towards benzene.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer27)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Nitration of toluene is easier than benzene.
    Reason: The methyl group in toluene is electron-releasing.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer28)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Benzene forms benzene sulphonic acid with fuming \[{{H}_{2}}S{{O}_{4}}\] at high temperature.
    Reason: The attacking species is \[S{{O}_{3}}\].

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer29)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Activating groups are electron donors.
    Reason: Nitroso group is activating group.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer30)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Benzene reacts with \[C{{H}_{3}}COCl\] to give chlorobenzene.
    Reason: Chlorination is an electrophilic substitution reaction.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer31)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Conjugated polyenes containing odd number of carbon atoms is known as annulenes.
    Reason: General formula of annulenes is \[{{(CH=CH)}_{n}}\] where \[n=2,3,4\] etc.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer32)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Tropylium cation is aromatic in nature
    Reason: The only property that determines its aromatic behaviour is its planar structure.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer33)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: [10] Annulene is not aromatic though it contains Huckel number of \[\pi \] electrons.
    Reason: Steric interaction between internal hydrogens makes it non planar.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer34)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Rates of nitration of benzene and hexadeuterobenzene are different.
    Reason: \[C-H\] bond is stronger than \[C-D\]bond

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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  • question_answer35)

    Read the assertion and reason carefully to mark the correct option out of the options given below:
    Assertion: Cyclolpentadienyl anion is much more stable than allyl anion.
    Reason: Cyclopentadienyl anion is aromatic in character.

    A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C) If assertion is true but reason is false.

    D) If the assertion and reason both are false.

    E) If assertion is false but reason is true.

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Question - Assertion and Reason
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