Which one of the following free radical is most stable?
Correct answer: C. (CH3)3C+
- A. CH3+
- B. (CH3)2CH+
- C. (CH3)3C+
- D. C2H5+
Explanation
Options A and D are incorrect as they are primary free radicals. Option B is incorrect as it's a secondary free radical. Option C is correct as it is a tertiary free radical. The order of stability is Primary radical < Secondary radical < Tertiary radical.
This question appeared on the HEC Phase I 2017 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Free Radical Substitution
Free radical substitution explains how alkanes react with halogens under ultraviolet light or heat through initiation, propagation and termination steps. The mechanism involves homolytic bond fission and radical intermediates, while product formation depends on the relative stability of radicals and differs from ionic substitution.
Practise Chemistry of Hydrocarbons
1,091 free Chemistry of Hydrocarbons MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Free Radical Substitution questions
The reaction mechanism of alkanes with halogens is known as;
Consider reversibility in free radical substitution reaction of alkane then Kc value is smallest for:
Which one of the following free radical is most stable:
Which of the following represents the equation for the reaction between ethane and chlorine in the presence of UV radiation?
H2 and Cl2 do not react in the dark, but in the presence of light a vigorous reaction is initiated due to the formation of:
Which of the following Halogen reacts fast with alkanes in substitution reactions?