question_answer

The increasing dipole moments of the following compounds is                               

A) \[\text{I }<\text{ III }<\text{ IV }<\text{ II}\]    

B) \[\text{II}=\text{IV}<\text{III}<\text{I}\]

C) \[\text{II=IIVIII}\]

D) \[\text{IIIIIIIV}\]

Correct Answer: B

Solution :

(II) and (IV) are symmetrical and thus, resultant dipole moment is zero. In (I) bond moment are towards the same direction but in (III) there is net dipole at the \[{{C}_{2}}\] position. Thus, the dipole moment of (\[I\]) is maximum.                     Thus. the correct order is \[\text{II = IV  III  I}\]