Consider the following reaction sequence: CH ₃ Cl KCN X LiAlH ₄ Y [ alc. KOH ] CHCl ₃, Z The chemical formula of the final product Z is:

Step-by-step solution

Chloromethane undergoes nucleophilic substitution with KCN to form ethanenitrile ( X ), which steps up the carbon chain by one carbon atom. CH ₃ Cl + KCN CH ₃ CN (X) + KCl Reduction of ethanenitrile with LiAlH ₄ yields ethanamine ( Y ). CH ₃ CN LiAlH ₄ CH ₃ CH ₂ NH ₂ (Y) Heating ethanamine (a primary amine) with chloroform and alcoholic KOH results in the Carbylamine reaction, producing ethyl isocyanide ( Z ). CH ₃ CH ₂ NH ₂ + CHCl ₃ + 3 KOH CH ₃ CH ₂ NC (Z) + 3 KCl + 3 H ₂ O Thus, the final product Z is CH ₃ CH ₂