UPSC Combined Geo-Scientist, Mains · 2018 · Mains Paper III

Q8(d). pKa order of four carbonyl compounds

5 marks
Topic: Reactions at the carbonyl group
Question only

Question

Arrange the following carbonyl compounds in order of increasing pKa and rationalize the order: (CH₃CO)₂CH₂, CH₃CHO, CH₃COCH₃, (CH₃CO)₃CH.

Model answer

The free solution for 2018 answers questions 1, 4, 5, 6, 7 and 10, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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Coversalpha hydrogen acidityenolate stability1,3-dicarbonylpKa

All parts of Question 8

8(a) Increasing stability of carbocations5 marks
8(b) Identify the antiaromatic compound5 marks
8(c) Reagents for an alkyne-to-alkene transformation5 marks
8(d) pKa order of four carbonyl compounds5 marks
8(e) Identify A (C₁₀H₁₆O) and B from tests and ozonolysis10 marks