Question

Arrange the following compounds in the increasing order of polarity.

• A. $I<II<III$
• B. $III<II<I$
• C. $II<I<III$
• D. $III<I<II$

Answer 1

The correct option is C $II<I<III$


On polarisation of compound $II$, it becomes anti-aromatic in nature which destabilises it. Therefore, its polarity or dipole moment is the lowest.

Compound $III$ on polarisation attains aromaticity which stabilises it, so it has the highest dipole moment.

The order of polarity is: $II<I<III$