Which of the following is an example of primary amine?

Which of the following is an example of primary amine?
  1. $\mathrm{N}$-methyl aniline
  2. $\mathrm{N}$-phenylbenzenamine
  3. Methyl phenylamine
  4. Isopropyl amine

Asked in: MHT CET 2021 (23 Sep Shift 1)

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