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Aldehydes, Ketones and Carboxylic Acids · Question 66

AIPMT 2007MCQEasy📈 Topic in 12% papers+4−1
1

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

Answer

(1) C6H5CHO

Solution

As per NCERT, aldehydes which do not have an α-hydrogen atom undergo self oxidation and reduction (disproportionation) on heating with concentrated alkali – Cannizzaro reaction.

C6H5CHO has no α-hydrogen:

2C6H5CHO + conc. NaOH C6H5CH2OH + C6H5COONa

⇒ CH3CH2CH2CHO and C6H5CH2CHO have α-hydrogens (they undergo aldol condensation); acetone is a ketone.

∴ Benzaldehyde gives the alcohol and the acid (as its salt).

Answer: (1)

AIPMT 2007

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

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
3

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
4

Nucleophilic addition reaction will be most favoured in

  1. CH3CHO
  2. CH3-CH2-CH2- O \|C-CH3
  3. (CH3)2C=O
  4. CH3CH2CHO
AIPMT 2006
5

Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields

  1. ethyl propionate
  2. ethyl butyrate
  3. acetoacetic ester
  4. methyl acetoacetate
AIPMT 2006
6

In a set of reactions acetic acid yielded a product D. CH3COOH SOCl2 A [anhy. AlCl3]benzene B HCN C HOH D The structure of D would be

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2005
7

When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is (are)

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2003
8

A and B in the following reactions are : [figure]

  1. [figure]
  2. [figure]
  3. A = RR'CHCN, B = NaOH
  4. [figure]
AIPMT 2003
9

[figure] In the above reaction product P is

  1. [figure]
  2. [figure]
  3. [figure]
  4. C6H5- O \|C-C6H5
AIPMT 2002
10

In the following reaction product P is R- O \|C-Cl [Pd-BaSO4]H2 P

  1. RCH2OH
  2. RCOOH
  3. RCHO
  4. RCH3
AIPMT 2002
11

[figure] Product 'P' in the above reaction is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2002

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