JEE Main · 2011 · 10 Apr 2011 · Offline · Aldehydes Ketones and Carboxylic Acids

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Trichloroacetaldehyde was subjected to Cannizzaro's reaction by using NaOH . The mixture of the products contains sodium trichloroacetate and another compound. The other compound is :

(A)Trichloromethanol
(B)2, 2, 2-Trichloropropanol
(C)Chloroform
(D)2, 2, 2-Trichloroethanol✓ Correct

Answer: (D)

Solution

Trichloroacetaldehyde,

CC l_{3} CHO

, has no

α

-hydrogen, so with sodium hydroxide it undergoes the Cannizzaro disproportionation,

2CC l_{3} CHO O H^{-} CC l_{3} COONa + CC l_{3} C H_{2} OH

: one molecule is oxidised to sodium trichloroacetate while the other is reduced to the alcohol. The other compound is

CC l_{3} C H_{2} OH

, 2,2,2-trichloroethanol.

JEE Main · 2011 · 10 Apr 2011 · Offline · Single correct option

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