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

• A

  $\mathrm{Sn} / \mathrm{HCl}$
• B

  $\mathrm{Na}-\mathrm{Hg} / \mathrm{H}_2 \mathrm{O}$
• Correct answer
  C

  $\mathrm{NH}_3$ (alc)
• D

  $\mathrm{LiAlH}_4$

Hence, the correct answer is option: 'C'.