Question

How many distinct terminal alkynes exist with a molecular formula of $C_5{H}_8$?

• A. 1
• B. 2
• C. 3
• D. 4
• E. 5

Answer 1

The correct option is B 2

The given 3 alkyne isomers of $C_5{H}_8$ are possible out of which 2 are terminal alkynes i.e. containing triple bond at the terminal carbon atom.

The 2 terminal alkynes with molecular formula $C_5{H}_8$ are :-

1. pent-1-yne
2. 3-methyl but-1-yne

Thus, option B is correct.