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Aldehydes, Ketones and Carboxylic Acids
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Preparation of aldehydes and ketones
JEE Advanced level
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Difficulty 3 of 3
co053
Which of the following statements about the preparation of aldehydes and ketones are correct?
A
DIBAL-H at low temperature converts nitriles into aldehydes after hydrolysis
B
In the Rosenmund reduction the catalyst is partly poisoned to stop reduction at the aldehyde
C
The chromium complex in the Etard reaction prevents over-oxidation of the aldehyde
D
Friedel-Crafts acylation works well on nitrobenzene
Answer: A, B, C
The first three statements are standard facts. Nitrobenzene is strongly deactivated and does not undergo Friedel-Crafts acylation.
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