Complete the following reaction

Options

A. 1.5 D
B. 2.25 D
C. 1 D
D. 3 D

Answer

A

Explanation

In
bond moments at para positions cancel out. The remaining two groups are at meta positions to each other. Hence angle between them is `120^(@)`. Resultant of dipole moments is given by `mu=sqrt(mu_1^2+mu_2^2 +mu_1mu_2 cos theta)`
`=sqrt((1.5)^2+(1.5)^2+2xx1.5xx1.5 cos theta)`
`=sqrt(2.25+2.25+2(2.25).(-0.5))`
=1.5 D