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 :
Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are true and (R) is the correct explanation of (A)
(A) is false but (R) is true
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The Correct Option isC
Solution and Explanation
The dipole moment is a vector quantity. In the trans isomer of 2-butene, the dipoles of substituents are equal in magnitude but opposite in direction, resulting in a net dipole moment of zero (\(\mu = 0\)). However, in the cis isomer, the dipoles do not cancel out, making the molecule polar with \(\mu > 0\). Thus, the dipole moment of the cis form is greater than the trans form.
Cis isomer: \(\mu > 0\), Trans isomer: \(\mu = 0\).
Therefore, both the assertion and reason are true, and the reason correctly explains the assertion.
