
Compound (d) is aromatic, exhibiting enhanced stability via resonance. Compound (a) is antiaromatic, rendering it the least stable. Compounds (b) and (c) feature sp3 hybridized carbons with a negative charge. According to angle strain theory, compound (c) is more stable than compound (b) due to its ring structure.
Write the correct order of rate of reaction of following with PhN$_2$Cl 
Identify A in the following reaction. 