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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?

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