Question

What is 'X' in the following sequence? $Ar.N_{2}Cl\underset{KCN}{\overset{CuCN}{\to }}Z\stackrel{H.OH}{\to }Y\underset{\Delta }{\overset{\text{soda-lime}}{\to }}X$

• A. Benzoic acid
• B. Sodium benzoate
• C. Benzaldehyde
• D. Benzene

Answer 1

Answer: (D)

The reaction sequence is as follows:
$Ar{N}_{2}Cl\underset{\text{Sandmeyer’ s reaction}}{\overset{CuCN/KCN}{\to }}$
$ArCN\stackrel{H.OH}{\to }\underset{\text{benzoic acid}}{C_6{H}_{5}COOH}$
$\underset{\text{decarboxylation}}{\overset{\Delta ,\text{sodalime}}{\to }}\underset{\text{benzene}}{C_6{H}_6}$