Chemistry - GOC Question with Solution | TestHub

As we know compound (4) is aromatic and the compound (1) is anti-aromatic. Hence compound (4) is most stable and compound (1) is least stable among these in compound (2) and (3) carbon atom having charge is ${\mathrm{sp}}^3$ hybridised. On the basis of angle strain theory compound (3) is more stable than compound (2).