Identify the reagent R used in following conversion? tert-butyl bromide $\xrightarrow{\mathrm{R}}$ Isobutylene

Identify the reagent R used in following conversion? tert-butyl bromide $\xrightarrow{\mathrm{R}}$ Isobutylene
  1. $\mathrm{Sn} / \mathrm{HCl}$
  2. $\mathrm{Na}-\mathrm{Hg} / \mathrm{H}_2 \mathrm{O}$
  3. $\mathrm{NH}_3$ (alc)
  4. $\mathrm{LiAlH}_4$

Asked in: MHT CET 2024 (15 May Shift 1)

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