The compound that is insoluble in acetic acid is:

calcium oxide

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calcium carbonate

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calcium oxalate

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calcium hydroxide

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Solution

The correct option is C calcium oxalate
$C a O, C a C O_{3}$ and $C a (O H)_{2}$ are all bases and react with acetic acid to dissolve in $C H_{3} C O O H$ and form salt calcium acetate $(C H_{3} C O O)_{2} C a .$ .
But $C a C_{2} O_{4}$ is a salt and does not react with acetic acid. It ionizes into oxalate ions. Calcium oxalate is less soluble than calcium acetate. So, even if it dissolves, it will immediately precipitate.

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