Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Suman Kumar
Option B is correct
B is aromatic Sourav
lone pair of singlet carbon reside in sp2 hybrid orbital. So it will not be involved in resonance. Remember resonance needs P orbital..
Triplet carbene can be involved in resonance as both eletron reside in two P orbital. But only one of the two eletron can be involved in resonance