NEET-UG and JEE Main Chemistry · Class 12
Aldehydes and ketones - nucleophilic addition — NEET & JEE Questions
Aldehydes and ketones - nucleophilic addition is a topic in Organic Compounds Containing Oxygen, a Class 12 Chemistry chapter of the NEET-UG and JEE Main syllabus. TestBudy holds 12 published NEET-UG and JEE Main questions on Aldehydes and ketones - nucleophilic addition, each with the marking scheme of the real paper.
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Aldehydes and ketones - nucleophilic addition MCQs with solutions
10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
In a carbonyl group, which atom is the principal electrophilic centre during nucleophilic addition?
- A. The carbonyl carbon
- B. The carbonyl oxygen
- C. An alpha-hydrogen
- D. Any carbon attached to the carbonyl carbon
Why are aldehydes generally more reactive than ketones toward nucleophilic addition?
- A. Aldehydes have greater steric hindrance and stronger electron donation
- B. Aldehydes have less steric hindrance and usually less electron donation to the carbonyl carbon
- C. Ketones do not contain a polar carbonyl bond
- D. Aldehydes always carry a formal positive charge on carbon
Addition of HCN to an aldehyde or ketone gives which class of product?
- A. Cyanohydrin
- B. Acetal
- C. Oxime
- D. Hydrazone
Which carbonyl compound is expected to be most reactive toward nucleophilic addition?
- A. Methanal
- B. Ethanal
- C. Propanone
- D. Benzophenone
What is the product when propanone reacts with HCN?
- A. 2-Hydroxy-2-methylpropanenitrile
- B. 2-Methylpropan-2-ol
- C. Propan-2-ol
- D. 2-Hydroxypropanal
Ethanal reacts with methylmagnesium bromide followed by hydrolysis. Which alcohol is formed?
- A. Methanol
- B. Ethanol
- C. Propan-2-ol
- D. Propan-1-ol
Methanal reacts with ethylmagnesium bromide followed by hydrolysis. What is the organic product?
- A. Ethanol
- B. Propan-1-ol
- C. Propan-2-ol
- D. Butan-1-ol
Benzaldehyde is treated with HCN. Which structural change occurs at the carbonyl carbon?
- A. It becomes bonded to both OH and CN
- B. It becomes bonded to two OH groups
- C. The carbonyl group is replaced by a carboxyl group
- D. The phenyl ring is directly substituted by CN
Which sequence correctly gives the decreasing order of reactivity toward nucleophilic addition?
- A. Methanal > ethanal > propanone > benzophenone
- B. Benzophenone > propanone > ethanal > methanal
- C. Propanone > ethanal > methanal > benzophenone
- D. Ethanal > methanal > benzophenone > propanone
A carbonyl compound reacts with methylmagnesium bromide followed by hydrolysis to give 2-methylpropan-2-ol. What is ?
- A. Methanal
- B. Ethanal
- C. Propanone
- D. Butan-2-one
Common mistakes in Aldehydes and ketones - nucleophilic addition
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Recognises alkyl-group stabilization but applies it in the wrong direction to electrophilicity.
- Uses cyanohydrin formation as the deciding test even though both aldehydes and ketones can undergo that addition.
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