Which of the following produces nitrogen gas after the reaction with nitrous acid?

Which of the following produces nitrogen gas after the reaction with nitrous acid?
  1. $\left(\mathrm{CH}_3\right)_3 \mathrm{~N}$
  2. $\mathrm{C}_2 \mathrm{H}_5 \mathrm{NHC}_2 \mathrm{H}_5$
  3. $\left(\mathrm{C}_2 \mathrm{H}_5\right)_3 \mathrm{~N}$
  4. $\mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2$

Asked in: AP EAMCET 2023 (15 May Shift 2)

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