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KCET 2021 Chemistry Solved Paper
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© examsnet.com
Question : 60
Total: 60
The product 'A' gives white precipitate when treated with bromine water. The product 'B' is treated with barium hydroxide to give the product C. The compound C is heated strongly to form product D. The product D is
4-methylpent-3-en-2-one
but-2 enal
3 -methylpent-3-en-2-one
2-methylbut-2-enal
Validate
Solution:
The given reaction take place in following way
Phenol gives white ppt. with bromine water.
Acetone when treated with
Ba
(
OH
)
2
undergoes aldol condensation as follows
On healing further, ketol gives
4-methylpent-3-en-2-one
∴ The product D is 4 -methylpent-3-en-2-one.
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