NEET 2002 Chemistry question

Reactivity order of halides for dehydrohalogenation is :

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

In dehydrohalogenation (-elimination with alcoholic KOH) the C-X bond is broken in the rate-determining step, so reactivity depends on the C-X bond strength and on the leaving-group ability of . Bond strengths: C-F (452 kJ/mol) > C-Cl (351) > C-Br (293) > C-I (234),

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Question ID VK-089024