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Acetaldehyde reacts with semicarbazide and forms semicarbazone. Its structure is:

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Important Questions on Aldehydes, Ketones and Carboxylic Acids

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Chemistry Crash Course NEET>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>Level 2>Q 69

The cyanohydrin of a compound on hydrolysis, gives an optically active α-hydroxy acid. The compound is:

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Chemistry Crash Course NEET>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>Level 2>Q 70

Phenylmethyl ketone can be converted into ethylbezene in one step by which of the following reagents?

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Chemistry Crash Course NEET>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>Level 2>Q 71
Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and concentrated HCl is called
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Chemistry Crash Course NEET>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>Level 2>Q 72

The product formed in aldol condensation is

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Chemistry Crash Course NEET>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>Level 2>Q 73

On heating calcium acetate and calcium formate, the product formed is

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Chemistry Crash Course NEET>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>Level 2>Q 74

Calcium acetate on dry distillation gives 

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Chemistry Crash Course NEET>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>Level 2>Q 75

Acetone and acetaldehyde are differentiated by

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Chemistry Crash Course NEET>Chapter 25 - Aldehydes, Ketones and Carboxylic Acids>Level 2>Q 76

On heating acetaldehyde with ammonical silver nitrate solution, we get: