Q. A hydrocarbon $A \left( C _{4} H _{8}\right)$ on reaction with HCl gives a compound $B \left( C _{4} H _{9} Cl \right)$ which on reaction with 1 mol of $NH _{3}$ gives compound $C \left( C _{4} H _{10} N \right) .$ On reacting with $NaNO _{2}$ and $HCl$ followed by treatment with water, compound $C$ yields an optically active compound $D$. The $D$ is
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