(C) The given reactant is a tertiary amine,$(Ph-CH_2)_3N$. Tertiary aliphatic amines react with nitrous acid $(HNO_2)$ generated from $NaNO_2/HCl$ to

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(C) The given reactant is a tertiary amine,$(Ph-CH_2)_3N$. Tertiary aliphatic amines react with nitrous acid $(HNO_2)$ generated from $NaNO_2/HCl$ to form a salt,which is a nitrosoammonium salt. The reaction is: $(Ph-CH_2)_3N + HNO_2 \rightarrow (Ph-CH_2)_3N^{+}-N=O \, OH^{-}$. Thus,the product $(A)$ is $(Ph-CH_2)_3N^{+}-N=O$.