Paraldehyde is

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(B) Paraldehyde is formed by the trimerization of acetaldehyde $(CH_3CHO)$ in the presence of concentrated $H_2SO_4$ at room temperature.$3CH_3CHO \xr

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$A$ trimer of acetaldehyde

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(B) Paraldehyde is formed by the trimerization of acetaldehyde $(CH_3CHO)$ in the presence of concentrated $H_2SO_4$ at room temperature.$3CH_3CHO \xrightarrow{	ext{conc. } H_2SO_4, 	ext{ room temp.}} 	ext{Paraldehyde}$Since three molecules of acetaldehyde combine to form one molecule of paraldehyde,it is a trimer of acetaldehyde.Therefore,the correct option is $B$.

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