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Solution


Q.

When sec-butylcyclohexane reacts with bromine in the presence of sunlight, the major product is :                [2025]
1  
2  
3  
4  

Ans.

(4)

In free radical bromination of alkanes, that product is major which is formed by most stable free radical intermediate. Stability of free radicals is 3° > 2° > 1°. Out of two 3° carbons present in sec-butylcyclohexane, carbon I forms more stable free radical as it has more number of α H atoms.