Identify the product $\mathrm{A}$ in the following reaction

Identify the product $\mathrm{A}$ in the following reaction
  1. $\mathrm{H}_2 \mathrm{C}=\mathrm{CH}_2$
  2. $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_3$
  3. $\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{CH}$
  4. $\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}_2$

Asked in: MHT CET 2022 (10 Aug Shift 2)

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