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 :
(A)Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
(B)(A) is true but (R) is false
(C)Both (A) and (R) are true and (R) is the correct explanation of (A)✓ Correct
(D)(A) is false but (R) is true
Answer: (C)
Solution
Cis-2-butene has a net dipole moment because the two C-C bond dipoles do not cancel, while trans-2-butene is symmetric so its dipole moment is zero. Thus the cis form is more polar (A true), and the zero dipole of the trans isomer is precisely the reason the cis is more polar (R true and correctly explains A). Both true, R is the correct explanation.
JEE Main · 2024 · 05 Apr 2024 · Shift 1 · Single correct option
