Which of the following compounds undergoes E2 reactions more easily?

JEE Main Chemistry question

Which of the following compounds undergoes reactions more easily?

(A)CH_3CH_2CH_2CH_2Cl (1-chlorobutane, primary chloride)
(B)CH_3CH_2CH_2CH_2I (1-iodobutane, primary iodide)
(C)(CH_3)_2C(Br)-CH_2CH_3 (2-bromo-2-methylbutane, tertiary bromide)
(D) (2-iodo-2-methylbutane, tertiary iodide)Correct

Answer: (D)

Solution

elimination is favoured both by a better (more easily ionisable/more polarisable) leaving group and by a more substituted (tertiary) carbon bearing the leaving group (giving a more stable transition state/alkene). Iodide is

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Question ID VK-148331