Compare the bond dissociation energy of the labelled hydrogens (H_P, H_Q, H_R and H_S) in the following compound.

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TestHub · Accepted Answer

BDE is inversely proportional to the stability of the radical formed.

H_Q gives a tertiary benzylic radical (most stable), H_R gives an allylic radical, H_P gives a primary alkyl radical, H_S gives a vinyl radical (least stable).

So the BDE order is S $>$ P $>$ R $>$ Q.

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