Class 12 Chemistry Aldehydes and Ketones Notes and Important Questions
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Notes for Class 12 Aldehydes and Ketones (Chemistry) are shown above.
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Important Questions
An organic compound is used in the given figure to preserve museum specimens and also to prepare urinary antiseptics.
Write the reaction when the compound is heated with concentrated sodium hydroxide.
Draw the structure of urinary antiseptic.
Write the chemical reaction that would occur when the given preservative is treated with phenol in acidic medium.
How would you obtain the preservative from methanol?
A carbonyl compound with molecular formula C₃H₆O (it does not give silver mirror test) has treated with a compound Y which gives Z. Z on hydrolysis in acidic medium gives 2-hydroxy-2-methyl propanoic acid. Identify the carbonyl compound, Y and Z with proper reactions.
Compound A having molecular formula C₃H₆O under reduction gives B. Both compound A and B respond to iodoform test.
Identify compound A and B giving chemical reactions.
Give any two general methods of preparation of compound A.
Convert the compound B into pseudonitrol.
How is the functional isomer of B prepared by William’s synthesis?
The given table shows the compounds and their molecular formula. How can you convert P to Q, where Q is a compound in which two methyl groups are substituted at adjacent carbons? How is P obtained from T, where T is secondary alcohol? Write the reactions involved in the conversion of P into R and S?
Compounds — Molecular formula
P — C₃H₇Br
Q — C₆H₁₄
R — CH₂O
S — C₂H₄O
T — C₃H₈O
Which of the following has most acidic proton?
CH₃COCH₃
(CH₃)₂C=CH₂
CH₃COCH₂CH₃
(CH₃CH₂)₃CH
Write the principle behind the preparation of trichloromethane from acetone.
What is the product formed when Grignard reagent reacts with CH₃CN followed by hydrolysis?
alcohol
aldehyde
ketone
carboxylic acid
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Exam
Past Question Analysis
Historical exam-pattern data from past NEB question papers — not a prediction of future questions.
1
Question Items
1
Total Marks
1
Papers Appeared In
| Year | Question Items | Marks |
|---|---|---|
| 2082 | 1 | 1 |
Also appears in 7 model questions (not counted above — model sets aren't actual NEB exam history).
Aldehydes and Ketones focuses on carbonyl compounds and their characteristic reactions. Students learn their preparation, nomenclature, physical properties and chemical behavior, including addition reactions, oxidation and reduction. Important reactions such as Aldol, Cannizzaro, Clemmensen and Wolff-Kishner are also covered.
This page covers Aldehydes and Ketones, chapter 14 of 22 in the Class 12 Chemistry syllabus set by the National Examination Board (NEB). 11 important questions for this chapter are available, each with a full solution.
For numerical and derivation-based chapters like this one, working through past NEB questions is usually more useful than re-reading notes alone — try solving each important question above before checking the solution, then compare your working step by step.