wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The reactivity of hydrogen atoms attached to carbon atom in the halogenation of an alkane has the order:

A
Tertiary > Primary > Secondary
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Secondary > Primary > Tertiary
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Tertiary > Secondary > Primary
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Primary > Secondary > Tertiary
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C Tertiary > Secondary > Primary
For photochemical halogenation, the rate of the reaction is directly proportional to the stability of the intermediate formed.
The intermediates formed in photochemical halogenation is free radical.
Free radicals are stabilised by hyperconjugation effect.
More the number of αHydrogen more will be the stability of radicals. Thus tertiary radicals have more αHydrogen than secondary radical and primary have least αHydrogen. Thus, stability of free radicals follows the order,
Tertiary radical > Secondary radical > Primary radical

Therefore, the reactivity of hydrogen atoms attached to carbon atom in the halogenation of an alkane has the order,
Tertiary > Secondary > Primary
Thus, option (c) is correct.

flag
Suggest Corrections
thumbs-up
2
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon