CBSE 2025 · Region 1 · Set 1 · Q20 · 2 marks

Identify A and B in each of the following reaction sequence :

(a)

$\displaystyle \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl} \xrightarrow{\mathrm{NaCN}} \mathrm{A} \xrightarrow{\mathrm{H}_{2} / \mathrm{Ni}} \mathrm{B}$

(b)

$\displaystyle \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2} \xrightarrow[0-5^{\circ} \mathrm{C}]{\mathrm{NaNO}_{2} / \mathrm{HCl}} \mathrm{A} \xrightarrow[\mathrm{H}^{+}]{\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}} \mathrm{~B}$

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CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.