Question

Select the correct statement regarding the following compounds:


I II

• A. II has a greater dipole moment than I
• B. Covalent character of II is less than I
• C. I is more soluble than II in polar solvents
• D. None of these

Answer 1

Answer: (C)

I is more soluble than II in polar solvents

From the above structure of compound I, we can see that when the molecule is in its ionic form both the cyclic rings were aromatic which gives more stability to the compound.o, it will be polar in nature and dissolves in polar solvents.



In the above structure, one five membered ring has $4\pi$ electron which obeys $4n\pi$ electron rule and it is an anti-aromatic compound. Anti-aromatic compounds are less stable so the charge separation is not favoured. Hence it is less polar.
Dipole moment of I is more than II.
Therefore, compound I is more soluble in polar solvent than compound II.