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Aldehydes, Ketones and Carboxylic Acids · Question 51

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
1

Predict the products in the given reaction. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(3) [figure]

Solution

3-Chlorobenzaldehyde has no α-hydrogen, so with concentrated (50%) KOH it undergoes Cannizzaro reaction (self oxidation–reduction).

One molecule is reduced to 3-chlorobenzyl alcohol and the other is oxidised to the 3-chlorobenzoate ion:

2 ClC6H4CHO+KOH ClC6H4CH2OH+ClC6H4COO-K+

The aryl C–Cl bond is not attacked by KOH under these conditions (partial double bond character), so Cl remains at the meta position.

Answer: (3)

AIPMT 2012 (Prelims)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

Acetone is treated with excess of ethanol in the presence of hydrochloric acid. The product obtained is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2012 (Prelims)
3

The order of reactivity of phenyl magnesium bromide (PhMgBr) with the following compounds: [figure]

  1. III > II > I
  2. II > I > III
  3. I > III > II
  4. I > II > III
AIPMT 2011 (Mains)
4

Clemmensen reduction of a ketone is carried out in the presence of which of the following?

  1. Glycol with KOH
  2. Zn-Hg with HCl
  3. LiAlH4
  4. H2 and Pt as catalyst
AIPMT 2011 (Prelims)
5

Following compounds are given (i) CH3CH2OH (ii) CH3COCH3 (iii) CH3- CH3 |CHOH (iv) CH3OH Which of the above compound(s), on being warmed with iodine solution and NaOH, will give iodoform?

  1. (i), (iii) and (iv)
  2. Only (ii)
  3. (i), (ii) and (iii)
  4. (i) and (ii)
AIPMT 2010 (Mains)
6

Which one of the following compounds will be most readily dehydrated?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2010 (Mains)
7

In a set of reactions, ethylbenzene yielded a product D. [figure] D would be

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2010 (Prelims)
8

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
AIPMT 2010 (Prelims)
9

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)
10

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
11

A strong base can abstract an α-hydrogen from

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

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