Cyanogen gas is obtained in the reaction.

C u S O_{4 (a q)} + K C N \to

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K_{4} [F e (C N)_{6}] h e a t \to

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C H_{3} C N + H_{2} O Δ \to

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C H_{3} C O N H_{2} + P_{2} O_{5} Δ \to

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Solution

The correct option is A $C u S O_{4 (a q)} + K C N \to$
Option $(A)$ is correct.
Among the given options, only $C u S O_{4} (a q .)$ and $K C N$ react to form an unstable copper (II) cyanide which rapidly decomposes to give copper (I) cyanide and cyanogen.
$2 C u S O_{4} (a q) + 4 K C N ⟶ 2 C u (C N)_{2} + 2 K_{2} S O_{4}$
$2 C u (C N)_{2} ⟶ 2 C u C N + (C N)_{2} c y a n o g e n$

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