We’re being asked to rank the reaction rates of each compound for an SN2 reaction.
Recall that the SN2 reaction follows a backside attack from the nucleophile:
Steric interactions from additional R-groups makes it harder for the nucleophile to attack. This means a more substituted alkyl halide will have a slower reaction rate.
The relative rates for an SN2 reaction are: methyl (fastest) > 1˚ > 2˚ > 3˚ (slowest or no reaction)
Rank the SN2 reaction rates for the following compounds:
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