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91. Name the aldehyde used in the preparation of bakelite. Give its one industrial preparation.

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Acetyl chloride on reaction with dimethyl cadmium formation of acetone take place.

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93. What do you mean by condensation reactions?

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94.

Arrange the following in their increasing order of expected enol content.
CH₃COCH₂CHO, CH₃COCH₃, CH₃CHO, CH₃COCH₂ COCH₃.

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95.

Give a chemical test to distinguish between acetone and acetic acid.

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96. Give the balanced equation and name the products when acetic acid is treated with phosphorus pentachloride.

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97. During the formation of acid chloride, which bond C—OH or CO—H of carboxylic acid is broken?

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98. Why carboxylic acids are called fatty acids?

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99. How are formalin and trioxane related to methanol?

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100. Mention a chemical property in which methanoic acid differs from acetic acid.

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