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Solution


Q.

Consider the following compound (X)

The most stable and least stable carbon radicals, respectively, produced by homolytic cleavage of corresponding C–H bond are:          [2025]
1 II, IV  
2 III, II  
3 I, IV  
4 II, I  

Ans.

(4)

Radical at II is stabilized by resonance, hyperconjugation and +I effect.

Radicals at III and IV are stabilized by hyperconjugation and +I effect.

There is no stabilizing effect for radical at I.