Fundamentals of Organic ChemistryChemistryAldehydes and Ketones
In which of the following reactions is a new carbon-carbon bond formed? (i) Aldol condensation (ii) Kolbe's reaction (iii) Reimer-Tiemann reaction (iv) Wurtz-Fittig reaction
Options
- A(i) and (iii) only
- B(ii) and (iii) only
- C(i), (iii) and (iv) only
- D(i), (ii), (iii) and (iv)
Correct answer
D. (i), (ii), (iii) and (iv)
Step-by-step solution
In Aldol condensation, an enolate ion attacks a carbonyl carbon, forming a new carbon-carbon bond between two aldehyde or ketone molecules. In Kolbe's reaction, sodium phenoxide reacts with CO₂ to form salicylic acid. A new carbon-carbon bond is formed between the aromatic ring and the carbon atom of CO₂ . In the Reimer-Tiemann reaction, phenol reacts with chloroform in the presence of a base to form salicylaldehyde. A new carbon-carbon bond is formed between the aromatic ring and the carbon atom from chloroform (v