Which mechanism of reactions is shown by carbonyl compounds?
Correct answer: D. Nucleophilic addition
- A. Electrophilic addition
- B. Electrophilic substitution
- C. Free radical substitution
- D. Nucleophilic addition
Explanation
The main reactions of the carbonyl group are nucleophilic additions to the carbon‐oxygen double bond. This addition consists of adding a nucleophile and a hydrogen across the carbon‐oxygen double bond. An electrophilic addition reaction is an addition reaction where, in a chemical compound, a π bond is broken and two new σ bonds are formed. The substrate of an electrophilic addition reaction must have a double bond or triple bond. Electrophilic substitution reactions are chemical reactions in which an electrophile displaces a functional group in a compound. Free radicals are atoms or groups of atoms which have a single unpaired electron. A free radical substitution reaction is one involving these radicals. Free radicals are formed if a bond splits evenly - each atom getting one of the two electrons. The name given to this is homolytic fission.
Last updated
About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
Practise Aldehydes and Ketones
679 free Aldehydes and Ketones MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.