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NEET · Chemistry · STD 11 - 8.4. Organic chemistry reaction mechanism
Homolytic fission of the following alkanes forms free radicals \(CH_3 - CH_3, CH_3 - CH_2 \)\(- CH_3, (CH_3)_2CH - CH_3,\) \( CH_3 - CH_2 - CH(CH_3)_2.\) Increasing order of stability of the radicals is
- A \((CH_3)_2 \mathop C\limits^ \bullet - CH_2CH_3 < CH_3 - \mathop C\limits^ \bullet H - CH_3 <\)\( CH_3 - \mathop C\limits^ \bullet H_2 < (CH_3)_3 \mathop C\limits^ \bullet \)
- B \(CH_3 - \mathop C\limits^ \bullet H_2 < CH_3 - \mathop C\limits^ \bullet HH - CH_3 <\)\( (CH_3)_2 \mathop C\limits^ \bullet - CH_2 - CH_3 < (CH_3)_3 \mathop C\limits^ \bullet \)
- C \(CH_3 - \mathop C\limits^ \bullet H_2 < CH_3 - \mathop C\limits^ \bullet H - CH_3 <\)\( (CH_3)_3 \mathop C\limits^ \bullet < (CH_3)_2 \mathop C\limits^ \bullet - CH_2CH_3\)
- D \((CH_3)_3 \mathop C\limits^ \bullet < (CH_3)_2 \mathop C\limits^ \bullet - CH_2CH_3 <\)\( CH_3 - \mathop C\limits^ \bullet H - CH_3 < CH_3 - \mathop C\limits^ \bullet H_2\)
Answer & Solution
Correct Answer
(B) \(CH_3 - \mathop C\limits^ \bullet H_2 < CH_3 - \mathop C\limits^ \bullet HH - CH_3 <\)\( (CH_3)_2 \mathop C\limits^ \bullet - CH_2 - CH_3 < (CH_3)_3 \mathop C\limits^ \bullet \)
Step-by-step Solution
Detailed explanation
More the number of hyperconjugative structures, the greater is the stability.
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