Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Cis form of alkene is found to be more polar than the trans form. Reason (R) : Dipole moment of trans isomer of 2-butene is zero. In the light of the above statements, choose the correct answer from the options given below :

Assertion (A): Cis form of alkene is more polar than the trans form.

In the cis form, similar groups are on the same side, so bond dipoles add up, resulting in a net dipole moment. In the trans form, similar groups are on opposite sides, so dipoles cancel. Thus cis is more polar. True.

Reason (R): Dipole moment of trans isomer of 2-butene is zero.

In trans-2-butene, the two methyl groups and two H atoms are on opposite sides of the double bond, causing the dipole moments to cancel. Dipole moment is zero (or nearly zero). True.

The reason correctly explains the assertion — because trans forms have zero (or very low) dipole moment due to cancellation, cis forms are comparatively more polar.

The correct answer is Option (2): Both (A) and (R) are true and (R) is the correct explanation of (A).