Chemistry MCQs for NEET — Practice Questions with Answers

The Reformatsky reaction is a method for the preparation of β-hydroxy esters. It involves the reaction of an α-halo ester with a ketone or aldehyde in the presence of zinc metal, which forms a zinc enolate intermediate that reacts with the carbonyl compound to give the β-hydroxy ester product.

(b) Caproic acid is ${\mathrm{CH}}_3({\mathrm{CH}}_2{)}_4\mathrm{COOH}.$

(b) Lactic acid prepared from meat extract of muscles is dextro-rotatory and is therefore called sarcolactic acid 

(a) Resonance in carboxylate ions give rise to identical bond lengths.

(c) 2HgCl2 + HCOOH  ----->  Hg2Cl2  + 2HCl +CO2

(c) ${\mathrm{CH}}_2={\mathrm{CH}}_2 + {\mathrm{PdCl}}_2 + {\mathrm{H}}_2\mathrm{O} \stackrel{{\mathrm{CuCl}}_2}{\to }{\mathrm{CH}}_3\mathrm{CHO} + \mathrm{Pd} + 2\mathrm{HCl}$;

This is Wacker method.

(b) ${\mathrm{CH}}_3\mathrm{COOH} + {\mathrm{N}}_3\mathrm{H} \to {\mathrm{CH}}_3{\mathrm{NH}}_2 + {\mathrm{N}}_2 + {\mathrm{CO}}_2$

(C) ${\mathrm{CH}}_3\mathrm{COOH} \stackrel{X_2,\mathrm{P}}{\to }{\mathrm{CH}}_{2}X-\mathrm{COOH}$

(d) ${\mathrm{NH}}_2{\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{SO}}_3\mathrm{H} \rightleftharpoons \stackrel{+}{{\mathrm{NH}}_3}{\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{SO}}_3^{-}$

p-amino benzene sulphonic acid