Q78 / 160 · JIPMER 2004 · Chemistry

What is 'X' in the following sequence? Ar. $\mathrm{N}_2 \mathrm{Cl} \xrightarrow[\mathrm{KCN}]{\mathrm{CuCN}} \mathrm{Z} \xrightarrow{\mathrm{H}. \mathrm{OH}} \mathrm{Y} \xrightarrow[\Delta]{\text { soda-lime }} \mathrm{X}$

  • A
    Benzoic acid
  • B
    Sodium benzoate
  • C
    Benzaldehyde
  • Correct answer
    D
    Benzene

Solution

The reaction sequence is as follows: \(\mathrm{ArN}_2 \mathrm{Cl} \xrightarrow[\text { Sandmeyer's reaction }]{\mathrm{CuCNKCN}}\mathrm{ArCN} \xrightarrow{\mathrm{H} . \mathrm{OH}} \underset{\text{benzoic acid}}{\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}}\xrightarrow[\text { decarboxylation }]{\Delta \text {, sodalime }} \underset{\text { benzene }}{\mathrm{C}_6 \mathrm{H}_6}\)

Hence, the correct answer is option: 'D'.

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