Question

A primary alkyl halide would prefer to undergo _____________. (i) SN1 reaction

Answer 1

SN1 reaction depends upon the stability of the carbocation formed during substitution reaction. Since among primary, secondary, and tertiary carbocations, Primary carbocations are least stable. Therefore, it doesn’t undergo SN1 reaction.

Relative stabilities of carbocations :



SN1 mechanism :



In SN2 reaction, attack of nucleophile takes place from backward direction. Therefore, steric hindrance is one of the major factor in SN2. Since primary alkyl halide is the least sterically hindered among primary,secondary and tertiary alkyl halides. Therefore, Primary alkyl halides undergo SN2 mechanism.

SN2 mechanism :



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Anushree Anil, studied at Holy Child School

Answered May 21

Answer 2

Complete Question:

A primary alkyl halide would prefer to undergo _____________.

A) SN1 reaction

B) SN2 reaction

C) ∝-elimination

D) Racemisation

Answer:

Option B) SN2 reaction

If a substrate is chiral, the arriving nucleophile will attack from the opposite side of the leaving group due to less Steric hindrance, leading to configuration inversion.

Reaction Mechanism for SN2:

In an organic compound, the leaving group, which is often made up of halide groups or other electron-withdrawing groups, undergoes a nucleophilic substitution reaction with a nucleophile.

SN2 Reaction:

• A bond is broken and another is created simultaneously during the nucleophilic substitution reaction known as the SN2 reaction.
• The rate-determining phase of the reaction involves two reacting species.
• Substitution Nucleophilic Bimolecular is what the abbreviation "SN2" means.
• Bimolecular nucleophilic substitution, associative substitution, and interchange mechanism are other names for this kind of reaction.

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