Which one of the following statements does not correctly describe unimolecular nucleophilic substitution (SN1) reactions of...

Which one of the following statements does not correctly describe unimolecular nucleophilic

substitution (SN1) reactions of alkyl halides? (">" means "reacts faster than")

A) Carbocations are intermediates in unimolecular nucleophilic substitutions.

B) The order of decreasing reactivity as a function of leaving group is RI > RBr > RCl.

C) The order of alkyl bromide reactivity is R3CBr > R2CHBr > RCH2Br > CH3Br.

D) The rate of an SN1 reaction depends on the concentration of the nucleophile.

Please explain in details! thank you

Solutions

Expert Solution

A) Carbocations are intermediates in unimolecular nucleophilic substitutions.

True

Intermediates formed in SN1 reaction is carbocation

B) The order of decreasing reactivity as a function of leaving group is RI > RBr > RCl.

True

The one with lesser electronegativity will be more reactive in SN1

The order of electronegativity is Cl- > Br- > I-

C) The order of alkyl bromide reactivity is R3CBr > R2CHBr > RCH2Br > CH3Br.

True

Order of stability of carbocation intermediate is:

tertiary carbocation > secondary carbocation > primary carbocation

D) The rate of an SN1 reaction depends on the concentration of the nucleophile.

False

The rate of SN1 reaction depends only on substrate but not on nucleophile

Answer: D

queen_honey_blossom answered 2 years ago

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