Identify molecular formula of pyridine from following.

Identify molecular formula of pyridine from following.
  1. $\mathrm{C}_5 \mathrm{H}_{11} \mathrm{~N}$
  2. $\mathrm{C}_4 \mathrm{H}_4 \mathrm{~S}$
  3. $\mathrm{C}_4 \mathrm{H}_4 \mathrm{O}$
  4. $\mathrm{C}_5 \mathrm{H}_5 \mathrm{~N}$

Asked in: MHT CET 2021 (24 Sep Shift 2)

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