1.

In a S_(N)2 substitution reaction of the type R-Br+Cl^(-) overset(DMF)to R-Cl+Br^(-) which one of the following has thehighest relative rate?

Answer»

`CH_(3)-underset(CH_(3))underset(|)OVERSET(CH_(3))overset(|)(C)-CH_(2)Br`
`CH_(3)CH_(2)Br`
`CH_(3)-CH_(2)-CH_(2)Br`
`CH_(3)-underset(CH_(3))underset(|)(C)H-CH_(2)Br`

Solution :Rates of `S_(N)2` reactions are influenced by steric factors. Since `CH_(3)CH_(2)Br` has the least steric hindrance, therefore, it REACTS at the fastest rate.


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