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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.…

NEET UG 2013 — Chemistry Organic Chemistry

2013mcqhard

Homolytic fission of the following alkanes forms free radicals CH3−CH3\mathrm{CH}_3-\mathrm{CH}_3CH3​−CH3​, CH3−CH2−CH3,(CH3)2CH−CH3\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_3,\left(\mathrm{CH}_3\right)_2 \mathrm{CH}-\mathrm{CH}_3CH3​−CH2​−CH3​,(CH3​)2​CH−CH3​, CH3−CH2−CH(CH3)2\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}\left(\mathrm{CH}_3\right)_2CH3​−CH2​−CH(CH3​)2​. Increasing orders of stability of the radicals is:

Official previous-year question

Held on 30 Apr 2013 · Verified 9 Jul 2026.

Options

  1. A

    (CH3)2C−CH2CH3<CH3−CH−CH3<CH3−CH2<(CH3)3C\left(\mathrm{CH}_3\right)_2 \mathrm{C}-\mathrm{CH}_2 \mathrm{CH}_3 < \mathrm{CH}_3-\mathrm{CH} -\mathrm{CH}_3 < \mathrm{CH}_3-\mathrm{CH}_2 < \left(\mathrm{CH}_3\right)_3 \mathrm{C}(CH3​)2​C−CH2​CH3​<CH3​−CH−CH3​<CH3​−CH2​<(CH3​)3​C

  2. B

    CH3−CH2<CH3−CH−CH3<(CH3)2C−CH2−CH3(CH3)3C\mathrm{CH}_3-\mathrm{CH}_2 < \mathrm{CH}_3-\mathrm{CH}-\mathrm{CH}_3 < \left(\mathrm{CH}_3\right)_2 \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_3\left(\mathrm{CH}_3\right)_3 \mathrm{C}CH3​−CH2​<CH3​−CH−CH3​<(CH3​)2​C−CH2​−CH3​(CH3​)3​C

  3. C

    CH3−CH2<CH3−C˙H−CH3<(CH3)3C˙<(CH3)2C−CH2CH3\mathrm{CH}_3-\mathrm{CH}_2 < \mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3 < \left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}} < \left(\mathrm{CH}_3\right)_2 \mathrm{C}-\mathrm{CH}_2 \mathrm{CH}_3CH3​−CH2​<CH3​−C˙H−CH3​<(CH3​)3​C˙<(CH3​)2​C−CH2​CH3​

  4. D

    (CH3)3C˙<(CH3)2C˙−CH2CH3<CH3−CH−CH3<CH3−C˙H2\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}} < \left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2 \mathrm{CH}_3 < \mathrm{CH}_3-\mathrm{CH}-\mathrm{CH}_3 < \mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2(CH3​)3​C˙<(CH3​)2​C˙−CH2​CH3​<CH3​−CH−CH3​<CH3​−C˙H2​

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