
(\(d\))is most stable and compound (\(a\)) is least stable among these in compound (\(b\)) and (\(c\)) carbon atom of that positive charge is \(\mathrm{sp}^3\) hybridised they on the basis of angle strain theory compound (\(c\)) is more stable than compound (\(b\)).
$(1)$ બેન્ઝીન $(2)$ ટોલ્યુઈન $(3)$ ક્લોરો બેન્ઝિન $(4)$ ફિનોલ

$(1) H_3C - C = C⊝\,(2) H - C = C⊝ \,(3) $ ${H_3}C\,\, - \,\,\mathop C\limits^\Theta {H_2}$
