Solved papers for NEET Chemistry NEET PYQ-Aldehydes Ketones

done NEET PYQ-Aldehydes Ketones Total Questions - 37

• question_answer1) Aldol condensation will not take place in: [AIPMT 1999]
  A)
  \[HCHO\]
  done clear
  B)
  \[C{{H}_{3}}CHO\]
  done clear
  C)
  \[C{{H}_{3}}COC{{H}_{3}}\]
  done clear
  D)
  \[C{{H}_{3}}C{{H}_{2}}CHO\]
  done clear
  View Answer play_arrow

• question_answer2) Which of the following is incorrect?                                                         [AIPMT 2001]
  A)
  \[FeC{{l}_{3}}\] is used in detection of phenol      
  done clear
  B)
  Fehling solution is used in detection of glucose
  done clear
  C)
  Tollen's reagent is used in detection of unsaturation
  done clear
  D)
  \[NaHS{{O}_{3}}\] is used in detection of carbonyl compound
  done clear
  View Answer play_arrow

• question_answer3) Which one of the following is correct? [AIPMT 2001]
  A)
  On reduction of any aldehyde gives secondary alcohol
  done clear
  B)
  Reaction of vegetable oil with \[{{H}_{2}}S{{O}_{4}}\] gives glycerin
  done clear
  C)
  Alcoholic iodine with \[NaOH\] gives iodoform
  done clear
  D)
  Sucrose on reaction with \[NaCl\] gives invert sugar
  done clear
  View Answer play_arrow

• question_answer4) 

  In the following reaction product 'P’ is: [AIPMT 2002]

  \[R-\underset{\begin{smallmatrix}  |\,\,| \\  O \end{smallmatrix}}{\mathop{C}}\,-Cl\xrightarrow[Pd-BaS{{O}_{4}}]{{{H}_{2}}}P\]

  A)
  \[RC{{H}_{2}}OH\]
  done clear
  B)
  \[RCOOH\]
  done clear
  C)
  \[RCHO\]
  done clear
  D)
  \[RC{{H}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer5) 

  In this reaction:            [AIPMT 2003]

  \[C{{H}_{3}}CHO+HCN\xrightarrow[{}]{{}}C{{H}_{3}}CH(OH)CN\]\[\xrightarrow{H.OH}C{{H}_{3}}CH(OH)COOH\] an asymmetric centre is generated.

  The acid obtained would be:

  A)
  50% D + 50% L-isomer              
  done clear
  B)
  20% D + 80% L-isomer
  done clear
  C)
  D-isomer                                   
  done clear
  D)
  L-isomer           
  done clear
  View Answer play_arrow

• question_answer6) 

  A and B in the following reactions are [AIPMT 2003]

  A)
  \[A=RR'C{{H}_{2}}CN,\,B=NaOH\]                 
  done clear
  B)
  
  done clear
  C)
      
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer7) Which one of the following can be oxidised to the corresponding carbonyl compound? [AIPMT (S) 2004]
  A)
  2-hydroxy-propane         
  done clear
  B)
  ortho-nitro -phenol         
  done clear
  C)
  Phenol
  done clear
  D)
       2-methyl-2-hydroxy-propane
  done clear
  View Answer play_arrow

• question_answer8) 

  The major organic product formed from the following reaction:     [AIPMT (S) 2005]

  A)
  
  done clear
  B)
  
  done clear
  C)
   
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer9) A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of  \[\alpha \]-hydroxy acid. The carbonyl compound is:               [AIPMT (S) 2006]
  A)
  acetaldehyde
  done clear
  B)
  acetone
  done clear
  C)
  diethyl ketone
  done clear
  D)
  formaldehyde
  done clear
  View Answer play_arrow

• question_answer10) Nucleophilic addition reaction will be most favoured in:                         [AIPMT (S) 2006]
  A)
  \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\]                       
  done clear
  B)
  \[{{(C{{H}_{3}})}_{2}}C=O\]
  done clear
  C)
  \[C{{H}_{3}}C{{H}_{2}}CHO\]
  done clear
  D)
  \[C{{H}_{3}}CHO\]
  done clear
  View Answer play_arrow

• question_answer11) Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and cone. HCl is called: [AIPMT (S) 2007]
  A)
  Clemmensen reduction    
  done clear
  B)
  Cope reduction
  done clear
  C)
  Dow reduction
  done clear
  D)
  Wolff-Kishner reduction
  done clear
  View Answer play_arrow

• question_answer12) Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid? [AIPMT (S) 2007]
  A)
  C6H5CH2CHO
  done clear
  B)
  C6H5CHO
  done clear
  C)
  CH3CH2CH2CHO
  done clear
  D)
  \[\begin{align}   & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O \\  & C{{H}_{3}}-\overset{||}{\mathop{C}}\,-C{{H}_{3}} \\ \end{align}\]
  done clear
  View Answer play_arrow

• question_answer13) The product formed in aldol condensation is:                                      [AIPMT (S) 2007]
  A)
  a beta-hydroxy acid                               
  done clear
  B)
  a beta-hydroxy aldehyde or a beta-hydroxy ketone
  done clear
  C)
  an alpha-hydroxy aldehyde or ketone
  done clear
  D)
  an alpha, beta unsaturated ester
  done clear
  View Answer play_arrow

• question_answer14) Acetophenone when reacted with a base, \[{{C}_{2}}{{H}_{5}}ONa,\] yields a stable compound which has the structure [AIPMT (S) 2008]
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer15) A strong; base can abstract an \[\text{ }\!\!\alpha\!\!\text{ -}\]hydrogen from [AIPMT (S) 2008]
  A)
  alkene
  done clear
  B)
  amine
  done clear
  C)
  ketone
  done clear
  D)
  alkane
  done clear
  View Answer play_arrow

• question_answer16) Which of the following reactions will not result in the formation of carbon-carbon bonds? [AIPMT (S) 2010]
  A)
  Reimer-Tiemann reaction
  done clear
  B)
  Cannizaro reaction
  done clear
  C)
  Wurtz reaction
  done clear
  D)
  Friedel-Crafts acylation
  done clear
  View Answer play_arrow

• question_answer17) 

  Following compounds are given [AIPMT (M) 2010]

  A.\[\text{C}{{\text{H}}_{\text{3}}}\text{C}{{\text{H}}_{\text{2}}}\text{OH}\]              B.\[\text{C}{{\text{H}}_{\text{3}}}\text{COC}{{\text{H}}_{\text{3}}}\]

  C.\[\text{C}{{\text{H}}_{\text{3}}}-\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{C}{{\text{H}}_{\text{3}}} \end{smallmatrix}}{\mathop{\text{C}}}\,\text{HOH}\]                 D\[\text{C}{{\text{H}}_{\text{3}}}\text{OH}\]

  Which of the above compound (s), on being warmed with iodine solution and NaOH, will give iodoform?

  A)
  A, C and D
  done clear
  B)
  Only B
  done clear
  C)
  A, B and C
  done clear
  D)
  A and B
  done clear
  View Answer play_arrow

• question_answer18) Fructose reduces Tollen's reagent due to [AIPMT (M) 2010]
  A)
  asymmetric carbons
  done clear
  B)
  primary alcoholic group
  done clear
  C)
  secondary alcoholic group
  done clear
  D)
  enolisation of fructose followed by conversion to aldehyde by base
  done clear
  View Answer play_arrow

• question_answer19) Clemmensen reduction of a ketone is carried out in the presence of which of the following? [AIPMT (S) 2011]
  A)
  Zn-Hg with HCl
  done clear
  B)
  LiAlH4
  done clear
  C)
  H2 and Pt as catalyst
  done clear
  D)
  Glycol with KOH
  done clear
  View Answer play_arrow

• question_answer20) Which one is a nucleophilic substitution reaction among the following?           [AIPMT (S) 2011]
  A)
  \[\text{RCHO+R }\!\!'\!\!\text{ MaX}\xrightarrow[{}]{{}}\text{R}-\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{OH} \end{smallmatrix}}{\mathop{\text{CH}}}\,-\text{R}\]
  done clear
  B)
  \[\text{C}{{\text{H}}_{\text{3}}}-\text{C}{{\text{H}}_{\text{2}}}-\overset{\begin{smallmatrix}  \text{C}{{\text{H}}_{\text{3}}} \\  \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{CH}}}\,-\text{C}{{\text{H}}_{\text{2}}}\text{Br}\,\text{+}\,\text{N}{{\text{H}}_{\text{3}}}\xrightarrow[{}]{{}}\]
  done clear
  C)
  \[\text{C}{{\text{H}}_{\text{3}}}-\text{C}{{\text{H}}_{\text{2}}}-\overset{\begin{smallmatrix}  \text{C}{{\text{H}}_{\text{3}}} \\  \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{CH}}}\,-\text{C}{{\text{H}}_{\text{2}}}\text{N}{{\text{H}}_{2}}\]
  done clear
  D)
  \[\text{C}{{\text{H}}_{\text{3}}}\text{CHO}\,\text{+}\,\text{HCN}\xrightarrow[{}]{{}}\text{C}{{\text{H}}_{\text{3}}}\text{CH(OH)CN}\] \[\text{C}{{\text{H}}_{\text{3}}}-\text{CH}\,\text{=}\,\text{C}{{\text{H}}_{\text{2}}}+{{\text{H}}_{\text{2}}}\text{O}\xrightarrow[{}]{{{\text{H}}^{\text{+}}}}\] \[\text{C}{{\text{H}}_{\text{3}}}-\underset{\begin{smallmatrix}  | \\  \text{OH} \end{smallmatrix}}{\mathop{\text{CH}\,}}\,-\text{C}{{\text{H}}_{\text{3}}}\]
  done clear
  View Answer play_arrow

• question_answer21) 

  The order of reactivity of phenyl magnesium bromide (PhMgBr) with the following compounds [AIPMT (M) 2011]

  A)
        \[\text{III}\,\text{}\,\text{II}\,\text{}\,\text{I}\]
  done clear
  B)
  \[\text{II}\,\text{}\,\text{II}\,\text{}\,\text{III}\]
  done clear
  C)
  \[\text{I}\,\text{}\,\text{III}\,\text{}\,\text{II}\]
  done clear
  D)
  \[\text{I}\,\text{}\,\text{II}\,\text{}\,\text{III}\]
  done clear
  View Answer play_arrow

• question_answer22) 

  Predict the products in the given reaction,                                         [AIPMT (S) 2012]

  A)
  
  done clear
  B)
   
  done clear
  C)
   
  done clear
  D)
   
  done clear
  View Answer play_arrow

• question_answer23) Acetone is treated with excess of ethanol in the presence of hydrochloric acid. The product obtained is [AIPMT (S) 2012]
  A)
  \[\text{C}{{\text{H}}_{\text{3}}}\text{C}{{\text{H}}_{\text{2}}}\text{C}{{\text{H}}_{\text{2}}}\text{-}\overset{\begin{smallmatrix}  \text{O} \\  \text{ }\!\!|\!\!\text{  }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{C}}}\,\text{-C}{{\text{H}}_{\text{3}}}\]
  done clear
  B)
  \[\text{C}{{\text{H}}_{\text{3}}}\text{C}{{\text{H}}_{\text{2}}}\text{C}{{\text{H}}_{\text{2}}}\text{-}\overset{\begin{smallmatrix}  \text{O} \\  \text{ }\!\!|\!\!\text{  }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{C}}}\,\text{-C}{{\text{H}}_{2}}\text{C}{{\text{H}}_{\text{2}}}\text{C}{{\text{H}}_{\text{3}}}\]
  done clear
  C)
           
  done clear
  D)
   
  done clear
  View Answer play_arrow

• question_answer24) \[\text{C}{{\text{H}}_{\text{3}}}\text{CHO}\]and \[{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{5}}}\text{C}{{\text{H}}_{\text{2}}}\text{CHO}\] can be distinguished chemically by    [AIPMT (S) 2012]
  A)
  Benedict test     
  done clear
  B)
  Iodofrom test
  done clear
  C)
  Tollen's reagent test        
  done clear
  D)
  Fehling solution test
  done clear
  View Answer play_arrow

• question_answer25) An organic compound \[({{C}_{3}}{{H}_{9}}N)\] , when treated with nitrous acid, gave an alcohol and N2 gas was evolved. on warming with \[CHC{{l}_{3}}\] and caustic potash gave (C which on reduction gave iso-propylmethylamine. Predict the structure of.[AIPMT (M) 2012]
  A)
  
  done clear
  B)
  \[C{{H}_{3}}C{{H}_{2}}-NH-C{{H}_{3}}\]
  done clear
  C)
  \[\text{C}{{\text{H}}_{\text{3}}}-\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{C}{{\text{H}}_{\text{3}}} \end{smallmatrix}}{\mathop{\text{N}}}\,-\text{C}{{\text{H}}_{\text{3}}}\]        
  done clear
  D)
  \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}-N{{H}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer26) 

  Consider the reaction,        [AIPMT (M) 2012]

  \[RCHO+N{{H}_{2}}N{{H}_{2}}\xrightarrow[{}]{{}}RCH=N-N{{H}_{2}}\]What sort of reaction is it?

  A)
  Electrophilic addition elimination reaction
  done clear
  B)
  Free   radical   addition   elimination   reaction                                 
  done clear
  C)
  Electrophilic substitution elimination   reaction                                  
  done clear
  D)
  Nucleophilic    addition    elimination   reaction
  done clear
  View Answer play_arrow

• question_answer27) Which one is most reactive towards nucleophilic addition reaction?               [AIPMT 2014]
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer28) Treatment of cyclopentanone  with methyl lithium gives which of the following species? [NEET 2015 ]
  A)
  Cyclopentanonyl anion
  done clear
  B)
  Cyclopentanonyl cation
  done clear
  C)
  Cyclopentanonyl radical
  done clear
  D)
  Cyclopentanonyl biradical
  done clear
  View Answer play_arrow

• question_answer29) An organic compound X having molecular formula \[{{C}_{5}}{{H}_{10}}O\] yields phenyl hydrazone and gives negative response to the iodoform test and Tollen's test. It produces n-pentane on reduction. X could be [NEET 2015]
  A)
  pentanal
  done clear
  B)
  2-pentanone
  done clear
  C)
  3-pentanone
  done clear
  D)
  n-amyl alcohol
  done clear
  View Answer play_arrow

• question_answer30) Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by the elimination of water. The reagents is                               [NEET 2015 (Re)]
  A)
  a Grignard reagent
  done clear
  B)
  hydrazine in presence of feebly acidic solution
  done clear
  C)
  hydrocyanic acid        
  done clear
  D)
  sodium hydrogen sulphite
  done clear
  View Answer play_arrow

• question_answer31) The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha carbon, is :-[NEET - 2016]
  A)
  a carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol.
  done clear
  B)
  a carbonyl compound with a hydrgen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.
  done clear
  C)
  a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.
  done clear
  D)
  a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.
  done clear
  View Answer play_arrow

• question_answer32) The product formed by the reaction of an aldehyde with a primary amine is :- [NEET - 2016]
  A)
  Schiff base
  done clear
  B)
  Ketone
  done clear
  C)
  Carboxylic acid
  done clear
  D)
  Aromatic acid
  done clear
  View Answer play_arrow

• question_answer33) Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating? [NEET-2017]
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer34) 

  Consider the reactions: [NEET-2017]

  A)
  A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone
  done clear
  B)
  A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine
  done clear
  C)
  A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide
  done clear
  D)
  A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone
  done clear
  View Answer play_arrow

• question_answer35) 

  The correct increasing order of basic strength for the following compounds is   [NEET-2017]

  (i)

  (ii)

  (iii)

  A)
  II < I < III
  done clear
  B)
  II < III < I
  done clear
  C)
  III < I < II
  done clear
  D)
  III < II < I
  done clear
  View Answer play_arrow

• question_answer36) Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their [NEET - 2018]
  A)
  More extensive association of carboxylic acid via van der Waals force of attraction
  done clear
  B)
  Formation of carboxylate ion
  done clear
  C)
  Formation of intramolecular H-bonding
  done clear
  D)
  Formation of intermolecular H-bonding
  done clear
  View Answer play_arrow

• question_answer37) Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as [NEET 2020]
  A)
  Cannizzaro's reaction
  done clear
  B)
  Cross Cannizzaro’s reaction
  done clear
  C)
  Cross Aldol condensation
  done clear
  D)
  Aldol condensation
  done clear
  View Answer play_arrow