# What is the representation of "4-methylpent-2-yne"?

You want the representation of ${H}_{3} C - C \equiv C - C H {\left(C {H}_{3}\right)}_{2}$?
Well this is ${C}_{6} {H}_{10}$. Each hydrogen contributes 1 valence electron, and each carbon atom contributes 4 valence electrons. There are thus 17 bonds (single and multiple) comprising these 34 electrons. You will have to count these up to check on me!