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Aldehyde and ketone are distinguished by which reagent?

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Important Questions on Aldehydes, Ketones and Carboxylic Acids

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Beta Question Bank for Medical: Chemistry>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>BEGINNER'S BOX>Q 14
 By using which reaction carbonyl group is converted into methylene group?
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Beta Question Bank for Medical: Chemistry>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>EXERCISE-I (Conceptual Questions)>Q 1
When acetaldol is treated with excess of acid then unsaturated product will be :-
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Beta Question Bank for Medical: Chemistry>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>EXERCISE-I (Conceptual Questions)>Q 2
The reagent used for the separation of acetaldehyde from acetophenone is:
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Beta Question Bank for Medical: Chemistry>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>EXERCISE-I (Conceptual Questions)>Q 3

The major organic product formed from the following reaction is :-

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Beta Question Bank for Medical: Chemistry>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>EXERCISE-I (Conceptual Questions)>Q 4

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which is incorrect :-

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Beta Question Bank for Medical: Chemistry>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>EXERCISE-I (Conceptual Questions)>Q 5
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Beta Question Bank for Medical: Chemistry>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>EXERCISE-I (Conceptual Questions)>Q 6
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Beta Question Bank for Medical: Chemistry>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>EXERCISE-I (Conceptual Questions)>Q 7
Which of the following compounds is the product of an Aldol reaction?