Chemistry - GOC Question with Solution | TestHub

Bond i is a C-C bond inside the benzene ring (partial double bond, the strongest). Bond ii joins an sp² ring carbon to a CH₂ and is stronger than a plain sp³-sp³ bond. Bond iii joins two CH₂ groups, each of which gives a resonance-stabilised benzyl radical on breaking, so it is the weakest.

iii $<$ ii $<$ i.