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Solution


Q.

Given below are two statements:

Statement (I): SN2 reactions are 'stereospecific', indicating that they result in the formation of only one stereo-isomer as the product.

Statement (II): SN1 reactions generally result in formation of product as racemic mixtures.

In the light of the above statements, choose the correct answer from the options given below:                    [2024]
1 Both Statement I and Statement II are true  
2 Statement I is false but Statement II is true  
3 Both Statement I and Statement II are false  
4 Statement I is true but Statement II is false  

Ans.

(1)

Stereospecific reactions are those reactions for which if stereochemistry of reactants is changed, then major product formed is changed. In SN2 reactions, inversion occurs, so different stereoisomers give different products. Hence SN2 reactions are stereospecific.

In SN1 reactions, carbocation is formed as intermediate. Carbocation is planar hence nucleophile can attack from either side of the planar carbocation. This results in racemic mixture in products.