a. In compound (A), number of aromatic, antiaromatic, and non-aromatic rings are 4, 3, and 0, respectively.
b. In product (I), the number of aromatic, antiaromatic, and non-aromatic rings are 3, 0, and 4, respectively.
c. In product (II), the number of aromatic, antiaromatic, and non-aromatic rings are 3, 2 and 2, respectively.
The stability order is: aromatic gt antiaromatic gt nonaromatic
