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(C) When an aliphatic primary amine $(R-NH_2)$ reacts with nitrous acid ($HNO_2$,generated in situ from $NaNO_2 + HCl$) at low temperatures $(0-5 \ ^\

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$C$. An aliphatic primary amine

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(C) When an aliphatic primary amine $(R-NH_2)$ reacts with nitrous acid ($HNO_2$,generated in situ from $NaNO_2 + HCl$) at low temperatures $(0-5 \ ^\circ C)$,it forms an unstable alkyl diazonium salt which immediately decomposes to evolve nitrogen gas $(N_2)$ and forms an alcohol.$R-NH_2 + NaNO_2 + HCl 	o [R-N_2^+Cl^-] 	o R-OH + N_2 \uparrow + NaCl + H_2O$.In contrast,aromatic primary amines form stable diazonium salts at these temperatures,which do not evolve nitrogen gas unless heated. Therefore,the compound is an aliphatic primary amine.

When an organic compound was treated with sodium nitrite and hydrochloric acid in the ice-cold condition,nitrogen gas was evolved copiously. The compound is

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