Question

Which will undergo SN2 reaction fastest among the following
halogen compounds?
(a) CH₃CH₂F (b) CH₃CH₂Cl
(c) CH₃CH₂Br (d) CH₃CH₂I

Answer 1

Which will undergo SN2 reaction fastest among the following

halogen compounds?

(a) CH₃CH₂F

(b) CH₃CH₂Cl

(c) CH₃CH₂Br

(d) CH₃CH₂I

Answer 2

'CH₃CH₂I' will undergo fastest SN₂ reaction.

Option: (d)

Explanation:

• SN₂ reactions, generally, involves the formation of intermediate transition state. Hence, less hindered alkyl halides undergo SN₂ reaction readily than others.
• Also, C – I bond is less stable when compared to C – Br or C – Cl bond. This makes the alkyl iodides to be more reactive as compared to other halides.
• Thus, from the given options, CH₃CH₂I is the most reactive towards SN₂ reaction, when compared to others.

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