Answer :

(i) Since I- ion is a better leaving group than Br- ion, therefore, CH3I reacts faster CH3Br in SN2 reaction with OH- ion.

Note: Better the leaving group, faster is the SN2 reaction.

(ii) On steric grounds, 1 alkyl halides are more reactive than tert-alkyl halides in SN2 reactions. Therefore, CH3Cl will react at a faster rate than (CH3)3CCl in a SN2 reaction with OH- ion.(bulkier the g8roup, slower is the SN2 reaction.)

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