Which of the following molecules has two sigma $(\sigma)$ and two pi $(\pi)$ bonds?

Which of the following molecules has two sigma $(\sigma)$ and two pi $(\pi)$ bonds?
  1. $\mathrm{C}_2 \mathrm{H}_4$
  2. $\mathrm{N}_2 \mathrm{~F}_2$
  3. $\mathrm{C}_2 \mathrm{H}_2 \mathrm{Cl}_2$
  4. $\mathrm{HCN}$

Asked in: JEE Main 2014 (12 Apr Online)

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