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Aldehydes, Ketones and Carboxylic Acids · Question 58

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following reactions will not result in the formation of carbon-carbon bonds?

  1. Reimer-Tiemann reaction
  2. Cannizzaro reaction
  3. Wurtz reaction
  4. Friedel-Crafts acylation

Answer

(2) Cannizzaro reaction

Solution

Reimer–Tiemann reaction: –CHO is introduced into the phenol ring – a new C–C bond.

Wurtz reaction: 2RX + 2Na R-R + 2NaX – a new C–C bond.

Friedel–Crafts acylation: the RCO– group is attached to the ring – a new C–C bond.

Cannizzaro reaction: 2HCHO conc. KOH CH3OH + HCOOK – only hydride transfer (disproportionation); no new C–C bond is formed.

Answer: (2)

AIPMT 2010 (Prelims)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is

  1. CH3COOCH3
  2. CH3CONH2
  3. CH3COOCOCH3
  4. CH3COCl
AIPMT 2010 (Prelims)
3

Propionic acid with Br2/P yields a dibromo product. Its structure would be

  1. [figure]
  2. CH2(Br)-CH2-COBr
  3. [figure]
  4. CH2(Br)-CH(Br)-COOH
AIPMT 2009
4

A strong base can abstract an α-hydrogen from

  1. ketone
  2. alkane
  3. alkene
  4. amine
AIPMT 2008
5

The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of

  1. Acid anhydride > Amide > Ester > Acyl chloride
  2. Acyl chloride > Ester > Acid anhydride > Amide
  3. Acyl chloride > Acid anhydride > Ester > Amide
  4. Ester > Acyl chloride > Amide > Acid anhydride.
AIPMT 2008
6

Acetophenone when reacted with a base, C2H5ONa, yields a stable compound which has the structure

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2008
7

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called

  1. Cope reduction
  2. Dow reduction
  3. Wolff-Kishner reduction
  4. Clemmensen reduction
AIPMT 2007
8

The product formed in Aldol condensation is

  1. a beta-hydroxy aldehyde or a beta-hydroxy ketone
  2. an alpha-hydroxy aldehyde or ketone
  3. an alpha, beta unsaturated ester
  4. a beta-hydroxy acid.
AIPMT 2007
9

Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid?

  1. C6H5CHO
  2. CH3CH2CH2CHO
  3. CH3- O \|C-CH3
  4. C6H5CH2CHO
AIPMT 2007
10

Which of the following represents the correct order of the acidity in the given compounds ?

  1. FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH
  2. BrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOH
  3. FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH
  4. CH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH
AIPMT 2007
11

A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of α-hydroxy acid. The carbonyl compound is

  1. formaldehyde
  2. acetaldehyde
  3. acetone
  4. diethyl ketone
AIPMT 2006

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