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Aldehydes, Ketones and Carboxylic Acids

NEET 2013MCQEasy📈 Topic in 50% papers+4−1
Ques. 1NEET 2013

Reaction by which benzaldehyde cannot be prepared

  1. [figure] + CO + HCl in presence of anhydrous AlCl3
  2. [figure] + Zn/Hg and conc. HCl
  3. [figure] + CrO2Cl2 in CS2 followed by H3O+
  4. [figure] + H2 in presence of Pd-BaSO4

Answer

(2) [figure] + Zn/Hg and conc. HCl

Solution

(1) Gattermann–Koch reaction: benzene + CO + HCl (anhydrous AlCl3/CuCl) ⇒ benzaldehyde.

(2) Zn/Hg and conc. HCl is the Clemmensen reagent; it reduces a >C=O group of aldehydes and ketones to >CH2 and does not convert benzoic acid into benzaldehyde.

(3) Etard reaction: toluene + CrO2Cl2 in CS2, then H3O+ ⇒ benzaldehyde.

(4) Rosenmund reduction: benzoyl chloride + H2 / Pd–BaSO4 ⇒ benzaldehyde.

∴ Benzaldehyde cannot be prepared by reaction (2).

Answer: (2)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2NEET 2013 (Karnataka)

In the following reaction: HC CH [Hg2+]H2SO4 'P' Product 'P' will not give

  1. Tollen's reagent test
  2. Brady's reagent test
  3. Victor Meyer test
  4. Iodoform test
Ques. 3AIPMT 2012 (Mains)

Consider the reaction : RCHO + NH2NH2 RCH = N - NH2 What sort of reaction is it?

  1. Electrophilic addition-elimination reaction
  2. Free radical addition-elimination reaction
  3. Electrophilic substitution-elimination reaction
  4. Nucleophilic addition-elimination reaction
Ques. 4AIPMT 2012 (Mains)

Which of the following compounds will give a yellow precipitate with iodine and alkali?

  1. Acetophenone
  2. Methyl acetate
  3. Acetamide
  4. 2-Hydroxypropane
Ques. 5AIPMT 2012 (Mains)

Consider the following reaction [figure] The product A is

  1. C6H5CHO
  2. C6H5OH
  3. C6H5COCH3
  4. C6H5Cl
Ques. 6AIPMT 2012 (Prelims)

In the following sequence of reactions CH3-Br KCNA H3O+B [ether]LiAlH4C the end product (C) is

  1. acetone
  2. methane
  3. acetaldehyde
  4. ethyl alcohol
Ques. 7AIPMT 2012 (Prelims)

CH3CHO and C6H5CH2CHO can be distinguished chemically by

  1. Benedict's test
  2. Iodoform test
  3. Tollens' reagent test
  4. Fehling's solution test
Ques. 8AIPMT 2012 (Prelims)

The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is

  1. B > A > D > C
  2. B > D > C > A
  3. A > B > C > D
  4. A > C > B > D
Ques. 9AIPMT 2012 (Prelims)

Predict the products in the given reaction. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10AIPMT 2012 (Prelims)

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]
Ques. 11AIPMT 2011 (Mains)

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

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