Question

Select which compound is the most reactive in an SN1 reaction Br Select one: O III Assuming no other changes, what is the effect of doubling both the alkyl halide and the nucleophile concentrations in the reaction below? for OH 79 + HB Select one: O a quadruples the rate b. triples the rate c. doubles the rate O d. no change e. rate is halved B. Select which compound is the most reactive in an SN 1 reaction Sel -Br Br Br Select one: 01 o II O III

Answer 1

1)

All are tertiary alkyl halides.

The leaving groups in three compounds are Br-, I- and Cl-

Amount these three I- is good leaving group.

Therefore the most reactive compound in an SN1 reaction is II.

2)

H​​​​​​​​​​​​

here the alkyl halide is tertiary so it undergoes SN1 reaction.

The rate of SN1 Reaction is only depends on the concentration of alkyl halide but not on the concentration of nucleophile.

Rate = k[alkyl halide]

If the concentration of alkyl halide and nucleophile is double then rate is,

Rate = k[2× alkyl halide]

Rate = 2 × k[alkly halide]

Hence the rate of reaction is double.

Therefore the correct option is (c) doubles the rate

3)

The reactivity order of alkyl halides towards SN1 reaction is as follows:

3° > 2° > 1° > CH3-X

Compound I is tertiary alkyl halide.

Compound II is secondary alkyl halide

Compound is III is primary alkyl halide.

compound I is most reactive in an SN1 reaction

Therefore the correct option is (I)