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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]
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]
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]
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]
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]
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]
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.
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]
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 \[S{{O}_{3}}\].
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.
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.
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.
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.
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.
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
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.
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