Which is 4-Methyl-Cis-2-Hexene? (Organic Chemistry)?

Question

Which one of the structures below corresponds to 4-methyl-cis-2-hexene?

A. CH(CH3)=CH2-CH2-CH(CH3)2

B. CH3-CH(CH3)-CH(CH3)-C(CH3)=CH2

C. CH3-CH2-CH(CH3)-CH=CH(CH3)

D. CH3-CH2-CH(CH3)-C(CH3)=CH2

E. CH3-CH2-CH2-CH2-CH2(CH3)

Pleas explain why also.

Thanks!

Answer 1

(C)

Count from the right end to number the alkene (2-hexene).  Then that sets where you count from to put on the methyl group too (4-methyl).