Correct IUPAC name :

Options

A. 1-methyl-3-ethylcyclohexene
B. 5-ethyl-1-methylcyclohexene
C. 2-ethyl-4-methylcyclohexene
D. 3-ethyl-1-methylcyclohexene

Answer

B

Explanation

here , numbering is done in such a way that double bond gets first priority along with lowest number to the locants.
`:.`There are 2 substituents ethyl and methyl.
IUPAC name : 5-ethyl-1-methyl cyclohexene