Q.1 (iii) Acetonitrile may be prepared by heating the following reactants :
A. Ethyl chloride with alcoholic KCN
B. Ethyl chloride with alcoholic AgCN
C. Methyl chloride with alcoholic KCN
D. Methyl chloride with alcoholic AgCN
Best answer
Answer: C. Methyl chloride with alcoholic KCN
Answer: (c) Methyl chloride with alcoholic KCN
Acetonitrile is CH3CN (two carbons), so the alkyl halide must have one carbon. KCN is ionic and gives the cyanide (C attacks): CH3Cl + KCN (alc.) → CH3CN + KCl. AgCN is mainly covalent and gives isocyanides (CH3NC), and ethyl chloride with KCN gives propanenitrile.
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