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b. 4-chloro-3.5-dimethylhexcane 3-chloro-2,4-dimethylhexane cis-2-chloro-3-methy

ID: 698433 • Letter: B

Question

b. 4-chloro-3.5-dimethylhexcane 3-chloro-2,4-dimethylhexane cis-2-chloro-3-methylcyclohexane None of the above e. 12. Which is the most stable chair conformation of trans-1-ethy1-2- sopropy c. CH3 d. b. e. None of the above 13. 2,3-Dimethylbutane reacts with bromine in the presence of light to give a monobrominated product. Which of the following structures is correct? d. Both a and b b. Br Br e.None of the obove 14. Rank the following carbocations in decreasing order of 2) CH-EH-CH(CH 1>2 34 4>3>2>1 d. 3>1>4>2 e. 1>3>2>4 a 15. Rank the following radicals in increasing order of stability 3) c_e@s)CHaCH3 a. 4

Explanation / Answer

12) option A is correct

Explanation: The two groups, isopropyl and ethyl group are located on equatorial position with correct angle in structure A so it is correct.

13) option C is correct

Explanation: Reaction of alkane with Br2,hv gives tertiary alkyl halide as product.

14) option B is correct

Explanation: Benzyl carbocation is more stable than tertiary carbocation which is more stable than secondary carbocation which is more stable than primary carbocation.

15) option B is correct

Explanation: allyl radical is more stable than tertiary radical which is more stable than secondary radical which is more stable than primary radical.