The `IUPAC` name of `CH_(2) = CHCH(CH_(2)CH_(3))underset(Br)underset(|)(C)=CH_(2)` is

Options

A. (1) `4`-bromo-`3`-ethylpenta-`1,4`-diene
B. (2) `2`-bromo-`3`-ethylpanta-`1,4`-diene
C. (3) `2`-bromo-`3`-ethylpenta-`1,5`-diene
D. (4) non of these

Answer

B

Explanation

The compound contains two `C=C` bonds, i.e., it is an alkadiene. The numbering starts from the end nearer to the double bond.
`overset(5)(CH_(2))=overset(4)(CH)-underset("2-Bromo-3-ethylpenta-1,5-diene")(underset(CH_(2)CH_(3))underset(|)overset(3)(CH)-underset(Br)underset(|)overset(2)(C)=overset(1)(CH_(2)))`
The names of substituents should be listed alphabetically.