Question

Name the following H3C–CH = CH–CH3

HC ≡ C–CH3

Answer 1

H3C–CH = CH–CH3--HC ≡ C–CH3

Hept-5-en-2-yne

Answer 2

As there is 7 carbons the common name is hept.

as triple bond comes on 2nd carbon from the left we should take the serials from left to right,

there is also a double bond on 5th carbon.

therefore the name is

Hept 5 ene 2 yne