Question

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

• A. A is propene
• B. A is propane$-1,2-$diol
• C. B is propylbenzene
• D. B is $1,3,5-$trimethylbenzene

Answer 1

The correct option is 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