Question

why do we keep ether and acetone at cool places

Answer 1

Because, they are very volatile. They can easily evaporate at room temperatures. They take up the heat from the atmosphere and the molecules of acetone use this heat up to evaporate. So, this is the reason why they are kept at cool places.

Answer 2

This is because ether and acetone are volatile liquids, i.e, they have very low boiling point .
acetone's boiling point is 78.37°C and ether's is 56°C .

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