Question

Consider the following reaction `H_3C-undersetundersetD|CH-undersetunderset(CH_3)|CH-CH_3+Br to X + HBr` . Identify the structure of the major product X
A. `H_3C-undersetunderset(D)(|)CH-undersetunderset(CH_3)|CH-overset(dot)CH_2`
B. `H_3C-undersetundersetD|CH-undersetunderset(CH_3)|overset(dot)C-CH_3`
C. `H_3C-undersetundersetD|overset(dot)C-undersetunderset(CH_3)|CH-CH_3`
D. `H_3C-overset(dot)CH-undersetunderset(CH_3)|CH-CH_3`

Answer 1

Correct Answer - B
`CH_3-undersetunderset(D)(|)CH-undersetunderset(CH_3)|overset(dot)C-CH_3` is more stable fre radical among all other free radicals because t-alkyl free-radical is more stable than secondary or primary alkyl free radical (based upon hyperconjugation).