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Which of the following will NOT undergo SN1 reaction with OH- ?

(1) 

(2) CH2 = CH – CH2Cl

(3) (CH3)3CCl

(4) 

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Ans. (4) 

Sol. Primary alkyl halide does not give SN1 reaction.

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Option 4 SN1 mechanism depends on stability
Since 4 is less stable than all other options it doesn't not undergo SN1 mechanism
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Option 1 is correct bcoz after formation of carbocation on CH2 the carbocation shows resonant structure
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