JEE Main · 2014 · 06 Apr 2014 · Offline · Chemical Bonding and Molecular Structure

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For which of the following molecule significant μ ≠ 0?
(a)

(b)

(c)

(d)

(A)Only (c)
(B)(c) and (d)✓ Correct
(C)Only (a)
(D)(a) and (b)

Answer: (B)

Solution

A molecule shows a net dipole only when its bond dipoles do not cancel. The para-disubstituted benzenes carrying chlorine (a) and carrying cyano groups (b) are symmetric, so their opposed dipoles cancel and

μ = 0

. In (c) and (d), where the substituents can turn about their bonds, the various conformations do not all cancel, and the weighted average over them leaves a real dipole. A significant dipole moment therefore survives for (c) and (d).

JEE Main · 2014 · 06 Apr 2014 · Offline · Single correct option

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