Organic Chemistry Some Basic Principles And Techniques Ques 48
48. Homolytic fission of the following alkanes forms free radicals $CH_3-CH_3, CH_3-CH_2-CH_3$, $(CH_3)_2 CH-CH_3, CH_3-CH_2-CH(CH_3)_2$. Increasing order of stability of the radicals is
[NEET Kar. 2013]
(a) $(CH_3)_3 \dot{C}<(CH_3)_2 \dot{C}-CH_2 CH_3<$ $CH_3-\dot{C} H-CH_3<CH_3-\dot{C} H_2$
(b) $(CH_3)_2 \dot{C}-CH_2 CH_3<CH_3-\dot{C} H-CH_3<$ $CH_3-\dot{C} H_2<(CH_3)_3 \dot{C}$
(c) $CH_3-\dot{C} H_2<CH_3-\dot{C} H-CH_3<$ $(CH_3)_2 \dot{C}-CH_2-CH_3<(CH_3)_3 \dot{C}$
(d) $CH_3-\dot{C} H_2<CH_3-\dot{C} H-CH_3<(CH_3)_3$ $\dot{C}<(CH_3)_2 \dot{C}-CH_2 CH_3$
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Solution:
- (c) Stability depends on number of hyperconjugative structure.
BETA
