What is the organic product when bromoethane is heated with ethanolic potassium cyanide?
Correct answer B. Propanenitrile
Explanation
CN⁻ replaces Br⁻ by nucleophilic substitution: CH₃CH₂Br + CN⁻ → CH₃CH₂CN + Br⁻. The product propanenitrile has one more carbon atom, so this reaction lengthens the chain.
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