Which of the following alkenes do not show cis-trans isomerism?

I) 2-methyl-2-hexene
II) 1-chloro-1-butene
III) 1-methylcyclohexene
IV) 2-methyl-3-hexene

a) I, II
b) III, IV
c) II, III, IV
d) I, III

If you draw out the chain you wil see that in (ii) Cl can be cis or trans to the main chain.

You need to draw each of these, it is hard just from the names.

To determine which of the given alkenes do not show cis-trans isomerism, we need to examine the structure of each compound. Cis-trans isomerism occurs when two substituents on adjacent carbon atoms in the double bond are different.

I) 2-methyl-2-hexene: In this compound, the two substituents (methyl groups) on the double bond are the same, so it does not exhibit cis-trans isomerism.

II) 1-chloro-1-butene: In this compound, the substituents on the double bond are different (chlorine and hydrogen), so it can exhibit cis-trans isomerism.

III) 1-methylcyclohexene: In this compound, there is a cyclohexyl group on one end of the double bond and a methyl group on the other end. These substituents are different, so it can exhibit cis-trans isomerism.

IV) 2-methyl-3-hexene: In this compound, the two substituents (methyl groups) on the double bond are the same, so it does not exhibit cis-trans isomerism.

Therefore, the alkenes that do not show cis-trans isomerism are I) 2-methyl-2-hexene and IV) 2-methyl-3-hexene.

The answer is option (a) I, II.

I think that it might be "c"?????