Glycerol $(C H_{2} O H C H O H C H_{2} O H)$ is more viscous than ethanol because:

hydrogen bonding is more extensive in ethanol

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hydrogen bonding is more extensive in glycerol

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glycerol has higher molecular mass

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intramolecular H-bonding occurs in glycerol

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Solution

The correct option is B hydrogen bonding is more extensive in ethanol
Glycerol is more viscous than ethane because of the expensive hydrogen bonding in glycerol.Alcohol also exhibit hydrogen bonding but glycerol contains three on per molecule and alcohol has only are $O H$ group that can exhibit $H -$ bonding.

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