Alpha-hydrogen acidity, aldol, Cannizzaro, haloform
- Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating ? Answer: 3. [structure in figure] Key idea: in crossed aldol condensation with NaOH, either ketone can give the enolate and either can be the... 1
- Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as : Answer: 4. Cross Aldol condensation Benzaldehyde has no α -hydrogen, while acetophenone has α -hydrogens. In dilute NaOH, acetophenone forms... 1
- Compound A, C_8H_10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell.A and Y are respectively Answer: 2. 1-phenylethanol (C ₆ H ₅ -CH(OH)-CH ₃ ) and I ₂ A positive iodoform test (yellow precipitate with characteristic smell) needs a C... 1
- Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating ? Answer: 1. [structure: 2-cyclohexylidenecyclohexanone] Key idea: aldol condensation = aldol addition followed by loss of water on heating, g... 1
- The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon, is : Answer: 4. a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is... 1