Question

SN mechanisms
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Answer 1

In SN1 reaction, carbocation is formed as Intermediate and since tertiary carbocation is more stable than secondary carbocation which is more stable than primary carbocation. Hence, tertiary Alkyl halide (halogen containing carbon is attached to three carbons) react faster than secondary (halogen containing carbon is further attached to two carbons) which react faster than primary (halogen containing carbon is further attached to one carbon only). For SN2, order is reverse because it depends on steric hinderance.

1) Answer is d). Because d is tertiary Alkyl halide.

2) Answer is A). Because it is primary Alkyl halide.

3) Answer is D). Because I is good leaving group.

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