JEE Main · 2024 · 06 Apr 2024 · Shift 2 · General Organic Chemistry

The incorrect statement regarding the geometrical isomers of 2-butene is:

(A)cis-2-butene and trans-2-butene are not interconvertible at room temperature.
(B)cis-2-butene has less dipole moment than trans-2-butene.✓ Correct
(C)trans-2-butene is more stable than cis-2-butene.
(D)cis-2-butene and trans-2-butene are stereoisomers.

Answer: (B)

Solution

trans-2-Butene, the more symmetric (centrosymmetric) isomer, has zero net dipole moment, while cis-2-butene has a small but non-zero dipole moment because the two methyl-group bond moments do not cancel. So cis-2-butene has a greater dipole moment than trans-2-butene, not a smaller one — this makes the statement "cis has less dipole moment than trans" the incorrect one.

JEE Main · 2024 · 06 Apr 2024 · Shift 2 · Single correct option

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