Which of the following hydroxy compounds cont | vedclass

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(A) $1$. Crotonyl alcohol is $CH_3-CH=CH-CH_2OH$, which contains only one $-OH$ group.$2$. Ethylene glycol is $HO-CH_2-CH_2-OH$, which contains two $-

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Crotonyl alcohol

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(A) $1$. Crotonyl alcohol is $CH_3-CH=CH-CH_2OH$, which contains only one $-OH$ group.$2$. Ethylene glycol is $HO-CH_2-CH_2-OH$, which contains two $-OH$ groups.$3$. Pyrogallol is $1,2,3-trihydroxybenzene$, which contains three $-OH$ groups.$4$. Hydroquinone is $1,4-dihydroxybenzene$, which contains two $-OH$ groups.$5$. Therefore, only Crotonyl alcohol contains one $-OH$ group.

Which of the following hydroxy compounds contains only one $-OH$ group in a molecule?

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