The compound that forms a yellow oily liquid with nitrous acid is

• A

  2 -methyl aniline
• B

  methyl amine
• C

  Benzyl amine
• Correct answer
  D

  diethyl amine

Solution

Secondary amines (-NH group containing amines), when reacts with nitrous acid $\left(\mathrm{HNO}_{2}\right)$, a yellow oily nitroso compound is formed.

Hence, the correct answer is option: 'D'.