Question:
Which of the following reagents are used to convert propene to propyne?
Which of the following reagents are used to convert propene to propyne?
Show Hint
Alkene → Alkyne = halogen addition + double elimination.
Updated On: Apr 14, 2026
- SOCl$_2$/Py, alc. KOH, H$^+$/H$_2$O
- Br$_2$/CCl$_4$, alc. KOH/$\Delta$
- alc. KCN, SOCl$_2$
- alc. KOH, B$_2$H$_6$/H$_2$O$_2$
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept:
To convert alkene → alkyne:
•First add halogen → vicinal dihalide
•Then eliminate HX twice using strong base
Step 1: \[ \text{Propene} \xrightarrow{\mathrm{Br_2/CCl_4}} \text{vicinal dibromide} \]
Step 2: \[ \xrightarrow{\text{alc. KOH / } \Delta} \text{Propyne} \] \[ \therefore \text{correct answer = (B) Br$_2$/CCl$_4$, alc. KOH/$\Delta$} \]
•First add halogen → vicinal dihalide
•Then eliminate HX twice using strong base
Step 1: \[ \text{Propene} \xrightarrow{\mathrm{Br_2/CCl_4}} \text{vicinal dibromide} \]
Step 2: \[ \xrightarrow{\text{alc. KOH / } \Delta} \text{Propyne} \] \[ \therefore \text{correct answer = (B) Br$_2$/CCl$_4$, alc. KOH/$\Delta$} \]
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