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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…

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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 :

[JEE Main 2024, 05 Apr (Shift 1)]

a

Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

b

(A) is false but (R) is true

c

Both (A) and (R) are true and (R) is the correct explanation of (A)

d

(A) is true but (R) is false

✓ Correct answer: c)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Explanation

Assertion (A): Cis-alkenes are more polar than trans-alkenes.
True (dipoles add in cis form)

Reason (R): Dipole moment of trans-2-butene = 0.
True (dipoles cancel due to symmetry)

Since dipole cancellation in trans form explains why cis is more polar, the reason correctly explains the assertion.

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