The `IUPAC` name of
`CH_(2) =CH-CH=CH-underset(CH=CH_(2))underset(|)(CH)-C-=CH`
is

Options

A. (1) `2`-ethyntlhepta-`1,4,6`-triene
B. (2) `5`-ethylnyhepta-`1,3,6`-triene
C. (3) `5`-ethylnyhepta-`1,3`-dien-`6`-yne
D. (4) `3`-ethenylhepta-`4,6`-dien-`1`-yne

Answer

D

Explanation

The principal function is `C=C` while the secondary function is `C=C`. Select the longest possible continuous `C` chain carrying the maximum number of `C=C` bonds:
`overset(1)(CH_(2))=overset(2)(CH)-overset(3)(CH)=overset(4)(CH)-underset(overset(6)(CH)=overset(7)(CH_(2)))underset(|)overset(5)(CH)-C-=CH`
The direction of numbering is such that the `C's` of double bonds get the lowest set of locants.