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Aldehydes, Ketones and Carboxylic Acids

Short Answer Type

81. Mention two important uses of formalin.

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82.

Write one reaction to exemplify Friedel-Crafts acylation reaction?

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83. Write one chemical reaction to exemplify Cannizzaro reaction.

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84. Convert ethanal into but-2-enal.

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85.

What happens when methanal reacts with conc. NaOH?

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86.

Complete the equation:

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87. What happens when ethanal is distilled with dilute H₂SO₄ at 273 K?

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88. Which aldehyde smells like bitter almonds? Give its one use.

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89. Give one difference between the paraldehyde and metaldehyde.

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90. What type of aldehydes undergo Cannizzaro’s reaction?

Aldehydes which do not have an alpha hydrogen atom, undergo self-oxidation and reduction reaction on treatment with concentrated alkali. In this reaction, one molecule of the aldehyde is reduced to alcohol while another is oxidized to carboxylic acid salt.
For example,

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