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(C) $cis$-but$-2$-ene is more polar than $trans$-but$-2$-ene because the bond dipole moments cancel out in the symmetric $trans$-but$-2$-ene isomer. T

Vedclass · Accepted Answer

$I, III$ only

Vedclass · Answer

(C) $cis$-but$-2$-ene is more polar than $trans$-but$-2$-ene because the bond dipole moments cancel out in the symmetric $trans$-but$-2$-ene isomer. Thus,statement $I$ is correct.Due to its higher polarity,$cis$-but$-2$-ene has stronger intermolecular dipole-dipole interactions,resulting in a higher boiling point. Thus,statement $III$ is correct.The $trans$-isomer is more symmetric and packs better in the crystal lattice,leading to a higher melting point compared to the $cis$-isomer. Thus,statement $II$ is incorrect.

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