Which of the following reagents are used to convert propene to propyne?

• A

  $\mathrm{SOCl}_2 / \mathrm{Py}$, alc. $\mathrm{KOH}, \mathrm{H}^{+} / \mathrm{H}_2 \mathrm{O}$
• Correct answer
  B

  $\mathrm{Br}_2 / \mathrm{CCl}_4 /$ alc. $\mathrm{KOH} / \Delta$
• C

  alc. $\mathrm{KCN}, \mathrm{SOCl}_2$
• D

  alc. $\mathrm{KOH}, \mathrm{B}_2 \mathrm{H}_6 / \mathrm{H}_2 \mathrm{O}_2$

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