Multiple Choice

Which of the following is an example of nucleophilic addition to acetaldehyde?

AAcetal formation
Correct Answer
BCyanohydrin formation
Correct Answer
CBisulphite adduct
Correct Answer
DWolff-Kishner reaction

Solution

Out of the four choices A, B and C are examples of nucleophilic additions. where as Choice D is an example of Reduction reaction.

Therefore the questions has three answers A, B, and C.

A nucleophilic addition reaction is an addition reaction where a chemical compound with an electron deficient or electrophilic double or triple bond, a π bond, reacts with electron-rich reactant, termed a nucleophile, with disappearance of the double bond and creation of two new single, or σ, bonds.

With a carbonyl compound as an electrophile, the nucleophile can be:

· An alcohol in acetalisation to an acetal.

· A cyanide anion in Cyanohydrin reactions forming a cyanohydrin product.

· A sulphur ion from sodium bisulfite which forms a bisulfite adduct with aldehyde groups.

The only type which is not a nucleophilic addition is the Wolff-Kishner reaction, which is the REDUCTION of aldehydes and ketones to alkanes.

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