Question

Which of the following is the correct sequence of the following conversion?

• A. ${\mathrm{Br}}_2/{\mathrm{FeBr}}_3,{\mathrm{HNO}}_3/{\mathrm{H}}_2{\mathrm{SO}}_4,\mathrm{NaCN},{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}$
• B. ${\mathrm{HNO}}_3/{\mathrm{H}}_2{\mathrm{SO}}_4,{\mathrm{Br}}_2/{\mathrm{FeBr}}_3,\mathrm{Mg}/\mathrm{Ether},{\mathrm{CO}}_2,{\mathrm{H}}_3{\mathrm{O}}^{+}$
• C. $\mathrm{NaCN},{\mathrm{H}}_3{\mathrm{O}}^{+},{\mathrm{Br}}_2/{\mathrm{FeBr}}_3,{\mathrm{H}}_3{\mathrm{O}}^{+}/{\mathrm{CO}}_2/{\mathrm{H}}_2\mathrm{O}$
• D. ${\mathrm{HNO}}_3/{\mathrm{H}}_2{\mathrm{SO}}_4,{\mathrm{Br}}_2/{\mathrm{FeBr}}_3/\mathrm{NaCN}/{\mathrm{H}}_2\mathrm{O}$

Answer 1

The correct option is A

${\mathrm{Br}}_2/{\mathrm{FeBr}}_3,{\mathrm{HNO}}_3/{\mathrm{H}}_2{\mathrm{SO}}_4,\mathrm{NaCN},{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}$

The explanation for the correct option:

(a) ${\mathrm{Br}}_2/{\mathrm{FeBr}}_3,{\mathrm{HNO}}_3/{\mathrm{H}}_2{\mathrm{SO}}_4,\mathrm{NaCN},{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}$

1. Bromination of benzene.

2. Nitration of bromobenzene

3. Substitution of $\mathrm{Br}$ by $\mathrm{CN}$

4. Hydrolysis of 4-nitrobenzonitrile

Therefore, Option (a) is correct, ${\mathrm{Br}}_2/{\mathrm{FeBr}}_3,{\mathrm{HNO}}_3/{\mathrm{H}}_2{\mathrm{SO}}_4,\mathrm{NaCN},{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}$ is the correct sequence for the conversion.