# Which is most viscous?

$(a)\;CH_3OH \\ (b)\;C_2H_5OH \\(c)\;CH_2OH -CH_2OH \\(d)\;\text{none of these}$

Due to the presence of two OH groups $CH_2OH- CH_2OH$ its extent of H- bonding is more , hence it is most viscous.
Hence c is the correct answer.