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a
High molecular weight
b
High boiling point
c
Many hydrogen bonds per molecule
d
Fajan’s rule
answer is C.
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Detailed Solution
Glycerol and ethanol both have intermolecular hydrogen bonding but in glycerol (CH2OH.CHOH.CH2OH) hydrogen bonds per molecule is more than ethanol (C2H5OH). It increases attraction between the molecules and hence, glycerol is more viscous than ethanol.