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Q.

The reactivity order of below compounds with $KI$ in acetone is:

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a

ii > iii > iv > i

b

iv > iii > ii > i

c

iv > ii > iii > i

d

iii > iv > ii > i

answer is C.

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Detailed Solution

The nucleophile is an iodide ion, and the leaving group is a chloride ion.
Groups like the carbonyl group reduce the electron density on the C that is being attacked by a nucleophile. Therefore, the reactivity is increased by these groups.
Acetone is an aprotic solvent and can dissolve both the nucleophile and the substrate and thus SN² reaction is favoured.
Hence, the correct answer is option (C) iv > ii > iii > i

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