Compare the dipole moments of fulvene (a) and azulene (b). Is the dipole moment of (a) greater than, less than or equal to that of (b) ?
(a)
(b)

Question

Compare the dipole moments of fulvene (a) and azulene (b). Is the dipole moment of (a) greater than, less than or equal to that of (b) ? (a) (b)

TestHub · Accepted Answer

Fulvene (about 0.4 D) gains a little 6π cyclopentadienide character only in its dipolar form. In azulene (about 1.0 D) the dipolar form has two rings, each with 6π (tropylium and cyclopentadienide), so the charge separation is larger. So a < b.

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