Write the structures of A,B and C in the following:
`CH_(3)-Cl overset(KCN)to A overset(LiAlH_(4))to B overset(CHCl_(3)+alc." KOH")toC`

Explanation

To solve the problem, we will go through each step of the reaction sequence to identify the structures of compounds A, B, and C.

### Step 1: Reaction of CH₃Cl with KCN to form A

1. **Starting Compound**: CH₃Cl (methyl chloride)
2. **Reagent**: KCN (potassium cyanide)
3. **Mechanism**: SN2 (nucleophilic substitution)
4. **Process**: The cyanide ion (CN⁻) acts as a nucleophile and attacks the carbon atom in methyl chloride, displacing the chloride ion (Cl⁻).
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