Identify the correct stability order of following alkenes. I) ( CH_3 )_2 C = C ( CH_3 )_2, II) ( CH_3 )_2 C = CH_2 , III) ( CH_3 )_2 C = CHCH_3

MHT CET 2024 Chemistry question

Identify the correct stability order of following alkenes. I) , II) , III)

(A)III > II > I
(B)I > III > IICorrect
(C)II > I > III
(D)I > II > III

Answer: (B)

Solution

The stability of an alkene increases with the number of alkyl groups on the doubly bonded carbons, because of hyperconjugation (more -C-H bonds interacting with the bond) and the greater stability of an - C-C bond. Compound I, , is

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Question ID VK-096663