JEE Main & Advanced Chemistry Aldehydes, Ketones Question Bank

done Critical Thinking Aldehydes, Total Questions - 30

• question_answer1)
  Which of the following will fail to react with potassium dichromate and dilute sulphuric acid
  A)
                  Ethyl alcohol (ethanol) done clear
  B)
                  Acetaldehyde (ethanal) done clear
  C)
                  Secondary propyl alcohol (2-propanol) done clear
  D)
                  Acetone (propanone) done clear
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• question_answer2)
  Acetone and acetaldehyde are differentiated by [CPMT 1987, 93]
  A)
                  \[NaOH+{{I}_{2}}\]          done clear
  B)
                  \[Ag(N{{H}_{3}})_{2}^{+}\] done clear
  C)
                  \[HN{{O}_{2}}\]                done clear
  D)
                  \[{{I}_{2}}\] done clear
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• question_answer3)
  Which of the following will react with water        [IIT 1998]
  A)
                  \[CHC{{l}_{3}}\]                done clear
  B)
                  \[C{{l}_{3}}CCHO\] done clear
  C)
                  \[CC{{l}_{4}}\]   done clear
  D)
                  \[ClC{{H}_{2}}C{{H}_{2}}Cl\] done clear
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• question_answer4)
  An organic compound 'A' has the molecular formula \[{{C}_{3}}{{H}_{6}}O,\] it undergoes iodoform test. When saturated with dil. \[HCl\] is gives 'B' of molecular formula \[{{C}_{9}}{{H}_{14}}O\]. A and B respectively are [Tamil Nadu CET 2002]
  A)
  Propanal and mesitylene done clear
  B)
  Propanone and mesityl oxide done clear
  C)
  Propanone and 2,6-dimethyl -2, 5-heptadien-4-one done clear
  D)
  Propanone and mesitylene oxide done clear
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• question_answer5)
  Which alkene is formed from the following reaction \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CH=PP{{h}_{3}}+2-\,\text{Butanone}\]                [Manipal 2001]
  A)
                  3- Methyl-3-heptene done clear
  B)
                  4-Methyl-3-heptene done clear
  C)
                  5-Methyl-3-heptene done clear
  D)
                  1-Methyl-5- methane done clear
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• question_answer6)
  Compound ?A? (molecular formula \[{{C}_{3}}{{H}_{8}}O)\] is treated with acidified potassium dichromate to form a product ?B? (molecular formula \[{{C}_{3}}{{H}_{6}}O).\] ?B? forms a shining silver mirror on warming with ammoniacal silver nitrate. ?B? when treated with an aqueous solution of \[{{H}_{2}}NCONHN{{H}_{2}}.HCl\] and sodium acetate gives a product ?C?. Identify the structure of ?C?                 [IIT-JEE (Screening) 2002]
  A)
                  \[C{{H}_{3}}C{{H}_{2}}CH=NNHCON{{H}_{2}}\] done clear
  B)
                  \[C{{H}_{3}}-CH=\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,}{\mathop{NNH}}\,}}\,CON{{H}_{2}}\] done clear
  C)
                  \[C{{H}_{3}}CH=\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,}{\mathop{NCO}}\,}}\,NHN{{H}_{2}}\] done clear
  D)
                  \[C{{H}_{3}}C{{H}_{2}}CH-NCONHN{{H}_{2}}\] done clear
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• question_answer7)
  Which is not true about acetophenone  [Manipal 2002]
  A)
                  Reacts to form 2, 4-dinitorphenyl hydrazine done clear
  B)
                  Reacts with Tollen?s reagent to form silver mirror done clear
  C)
                  Reacts with \[{{I}_{2}}/NaOH\] to form iodoform done clear
  D)
                  On oxidation with alkaline \[KMn{{O}_{4}}\] followed by hydrolysis gives benzoic acid done clear
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• question_answer8)
  The enol form of acetone, after treatment with \[{{D}_{2}}O,\] gives [IIT-JEE (Screening) 1999]
  A)
                  \[C{{H}_{3}}-\overset{OD\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C=C{{H}_{2}}}}\,}}\,\]       done clear
  B)
                  \[C{{D}_{3}}-\overset{O\,\,}{\mathop{\overset{||\,\,\,\,}{\mathop{C-}}\,}}\,C{{D}_{3}}\] done clear
  C)
                  \[C{{H}_{2}}=\overset{\,OH}{\mathop{\overset{|\,\,\,\,\,}{\mathop{C-}}\,}}\,C{{H}_{2}}D\]       done clear
  D)
                  \[C{{D}_{2}}=\overset{OD}{\mathop{\overset{|\,\,\,\,\,}{\mathop{C-}}\,}}\,CD\] done clear
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• question_answer9)
  The appropriate reagent for the transformation [IIT-JEE (Screening) 2000]
  A)
                  \[Zn(Hg),\,HCl\]                done clear
  B)
                  \[N{{H}_{2}}N{{H}_{2}}O{{H}^{-}}\] done clear
  C)
                  \[{{H}_{2}}/Ni\]                done clear
  D)
                  \[NaB{{H}_{4}}\] done clear
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• question_answer10)
  Which of the following has the most acidic hydrogen [IIT-JEE (Screening) 2000]
  A)
                  3-hexanone       done clear
  B)
                  2, 4-hexanedione done clear
  C)
                  2, 5-hexanedione            done clear
  D)
                  2, 3-hexanedione done clear
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• question_answer11)
  Which of the following will be most readily dehydrated in acidic conditions           [IIT-JEE (Screening) 2000]
  A)
                         done clear
  B)
                  done clear
  C)
                  done clear
  D)
                  done clear
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• question_answer12)
                    Major Product is                               [IIT-JEE (Screening) 2003]
  A)
                                  done clear
  B)
                                  done clear
  C)
  done clear
  D)
  done clear
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• question_answer13)
  Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is [IIT 1997]
  A)
                  MeCOCl                done clear
  B)
                  MeCHO done clear
  C)
                  MeCOOMe         done clear
  D)
                  MeCOOCOMe done clear
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• question_answer14)
  Which of the following will give yellow precipitate with \[{{I}_{2}}/NaOH\]                                           [IIT 1997]
  A)
                  \[IC{{H}_{2}}COC{{H}_{2}}C{{H}_{3}}\]   done clear
  B)
                  \[C{{H}_{3}}COOCOC{{H}_{3}}\] done clear
  C)
                  \[C{{H}_{3}}CON{{H}_{2}}\] done clear
  D)
                  \[C{{H}_{3}}CH(OH)C{{H}_{2}}C{{H}_{3}}\] done clear
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• question_answer15)
  The product of acid hydrolysis of P and Q can be distinguished by    [IIT-JEE (Screening) 2003]
  A)
  Lucas Reagent   done clear
  B)
  2,4-DNP done clear
  C)
  Fehling's Solution            done clear
  D)
  \[NaHS{{O}_{3}}\] done clear
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• question_answer16)
  On vigorous oxidation by permanganate solution \[{{(C{{H}_{3}})}_{2}}C=CH-C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}\] gives        [AIEEE 2002]
  A)
        \[C{{H}_{3}}\underset{C{{H}_{3}}}{\overset{OH}{\mathop{\underset{|\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,}{\mathop{-C-\,\,\,}}}\,}}}\,\overset{OH\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,C{{H}_{2}}C{{H}_{3}}\] done clear
  B)
                  \[\begin{matrix}    C{{H}_{3}} & {} & {}  \\    {} & > & CHC{{O}_{2}}H+C{{H}_{3}}COOH  \\    C{{H}_{3}} & {} & {}  \\ \end{matrix}\] done clear
  C)
                  \[\begin{matrix}    C{{H}_{3}} & {} & {}  \\    {} & > & CHOH+C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH  \\    C{{H}_{3}} & {} & {}  \\ \end{matrix}\] done clear
  D)
                  \[\begin{matrix}    C{{H}_{3}} & {} & {}  \\    {} & > & C=O+C{{H}_{3}}C{{H}_{2}}COOH  \\    C{{H}_{3}} & {} & {}  \\ \end{matrix}\] done clear
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• question_answer17)
  Which of the following reactions give benzo phenone [Roorkee Qualifying 1998]
  A)
                  \[2{{C}_{6}}{{H}_{6}}+CC{{l}_{4}}\underset{\text{(ii) }{{H}_{2}}O}{\mathop{\xrightarrow{\text{(i) }AlC{{l}_{3}}}}}\,\] done clear
  B)
                  \[{{C}_{6}}{{H}_{6}}+{{C}_{6}}{{H}_{5}}COCl\underset{{}}{\mathop{\xrightarrow{AlC{{l}_{3}}}}}\,\] done clear
  C)
                  \[o-C{{H}_{3}}{{C}_{6}}{{H}_{4}}CO{{C}_{6}}{{H}_{5}}\xrightarrow{\text{Heat}}\] done clear
  D)
                  \[o-HOOC-{{C}_{6}}{{H}_{4}}-CO{{C}_{6}}{{H}_{5}}\underset{{{260}^{o}}C}{\mathop{\xrightarrow{Cu}}}\,\] done clear
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• question_answer18)
  Aldehyde and ketones can decolourize by           [CPMT 2003]
  A)
                  Bromine water  done clear
  B)
                  Quick lime done clear
  C)
                  dil. \[{{H}_{2}}S{{O}_{4}}\]           done clear
  D)
                  None of these done clear
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• question_answer19)
  Which of the following statements regarding chemical properties of acetophenone are wrong (1)          It is reduced to methyl phenyl carbinol by sodium and ethanol (2)          It is oxidised to benzoic acid with acidified \[KMn{{O}_{4}}\] (3)          It does not undergo iodoform electrophilic substitution like nitration at meta position (4)          It does not undergo iodoform reaction with iodine and alkali       [Tamil Nadu CET 2001]
  A)
                  1 and 2  done clear
  B)
                  2 and 4 done clear
  C)
                  3 and 4  done clear
  D)
                  1 and 3 done clear
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• question_answer20)
  The product(s) obtained via oxymercuration \[(HgS{{O}_{4}}+{{H}_{2}}S{{O}_{4}})\] of 1-butyne would be           [IIT-JEE 1999]
  A)
                  \[C{{H}_{3}}C{{H}_{2}}COC{{H}_{3}}\] done clear
  B)
                  \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CHO\] done clear
  C)
                  \[C{{H}_{3}}C{{H}_{2}}CHO+HCHO\] done clear
  D)
                  \[C{{H}_{3}}C{{H}_{2}}COOH+HCOOH\] done clear
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• question_answer21)
  The most reactive compound towards formation of cyanohydrin on treatment with KCN followed by acidification is                                        [GATE 2001]
  A)
                  Benzaldehyde   done clear
  B)
                  p-Nitrobenzaldehyde done clear
  C)
                  Phenyl acetaldehyde     done clear
  D)
                  p-Hydroxybenzaldehyde done clear
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• question_answer22)
  The key step in cannizzaro?s reaction is the intermolecular shift of                                            [Orissa JEE 2003]
  A)
                  Proton  done clear
  B)
                  Hydride ion done clear
  C)
                  Hydronium ion  done clear
  D)
                  Hydrogen bond done clear
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• question_answer23)
  Benzophenone does not react with        [BHU 2003]
  A)
                  \[RN{{H}_{2}}\] done clear
  B)
                  \[S{{O}_{3}}\] done clear
  C)
                  \[NaOH\] done clear
  D)
                  \[N{{a}_{2}}C{{O}_{3}}\] done clear
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• question_answer24)
  The most suitable reagent for the conversion of \[RC{{H}_{2}}OH\to RCHO\] is                                  [AIIMS 2004]
  A)
                  \[KMn{{O}_{4}}\] done clear
  B)
                  \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] done clear
  C)
                  \[Cr{{O}_{3}}\] done clear
  D)
                  PCC (Pyridine chloro chromate) done clear
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• question_answer25)
  The conversion of acetophenone to acetanilide is best accomplished by using :                                  [UPSEAT 2004]
  A)
                  Backmann rearrangement done clear
  B)
                  Curtius rearrangement done clear
  C)
                  Lossen rearrangement done clear
  D)
                  Hofmann rearrangement done clear
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• question_answer26)
  Which of the following will not give iodoform test? [UPSEAT 2004]
  A)
                  Isopropyl alcohol              done clear
  B)
                  Ethanol done clear
  C)
                  Ethanal done clear
  D)
                  Benzyl alcohol done clear
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• question_answer27)
                                                    The compound (X) is       [IIT-JEE 2005]
  A)
                  \[C{{H}_{3}}COOH\]        done clear
  B)
                  \[BrC{{H}_{2}}-COOH\] done clear
  C)
                  \[{{(C{{H}_{3}}CO)}_{2}}O\]        done clear
  D)
                  \[CHO-COOH\] done clear
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• question_answer28)
  The major organic product formed from the following reaction                                  [CBSE PMT 2005]                                                                
  A)
    done clear
  B)
                  done clear
  C)
                  done clear
  D)
                  done clear
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• question_answer29)
  Products of the following reaction                 \[C{{H}_{3}}C\equiv C\,C{{H}_{2}}C{{H}_{3}}\underset{(2)\,Hydrolysis}{\mathop{\xrightarrow{(1)\,{{O}_{3}}}}}\,\,\,\,...\text{are}\] [CBSE PMT 2005]
  A)
                  \[C{{H}_{3}}CHO+C{{H}_{3}}C{{H}_{2}}CHO\] done clear
  B)
                  \[C{{H}_{3}}COOH+C{{H}_{3}}C{{H}_{2}}CHO\] done clear
  C)
                  \[C{{H}_{3}}COOH+HOOCC{{H}_{2}}C{{H}_{3}}\] done clear
  D)
                  \[C{{H}_{3}}COOH+C{{O}_{2}}\] done clear
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• question_answer30)
  A compound, containing only carbon, hydrogen and oxygen, has a molecular weight of 44. On complete oxidation it is converted into a compound of molecular weight 60. The original compound is    [KCET 2005]
  A)
                  An aldehyde      done clear
  B)
                  An acid done clear
  C)
                  An alcohol           done clear
  D)
                  an ether done clear
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