CBSE Class 12 Chemistry Worksheet - Aldehydes / Ketones. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
Q1. Name the electrophilic and nucleophilic centre in a carbonyl compound. (1)
Q2. Why is an L-H acidic in carbonyl compounds? (1)
Q3. Presence of –CHO gp in benzaldehyde deactivates the ring towards Eθ sub-reactions, why? (1)
Q4. What is the change in hybridization of a carbonyl carbon atom during NUθ addition reactions? (1)
Q5. What is PCC, give one specific use of this reagent? (1)
Q6. What is DIBAL-H? Give one specific use of this reagent. (1)
Q7. Give formula of Roschelle salt. What is its role in Fehling solu? (1)
Q8. How does benedict solu differ from fehling solu? (1)
Q9. What is formalin? Give one important use of formalin. (1)
Q10. Give one character feature of LiALH4 as a reducing agent. (1)
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