Question

For the given reaction , choose the correct option(s) :

• A. A is propene
• B. A is propyne
• C. B is propylbenzene
• D. B is 1,3,5-trimethylbenzene

Answer 1

Answer: (B), (D)

B is 1,3,5-trimethylbenzene

Vicinal dihalides on treatment with alcoholic KOH undergo dehydrohalogenation. One molecule of HX is eliminated to form alkenyl halide which on treatment with sodamide gives alkyne.
So, A is propyne.
Cyclic Polymerisation of Alkynes:
Three molecules of propyne polymerise to give one molecule of 1,3,5-trimethylbenzene (Mesitylene)
B is 1,3,5-trimethylbenzene