answer is
ethanol
Generally, solvents with dielectric constants greater
than about 5 are considered \"polar\" and those with dielectric
constants less than 5 are considered \"non-polar.\"
in this case
ethanol has dielectric constant is 24.3
in the remaining
acetone has 21
DMF has38
DMSO has 47
all are poalr
next
protic solvents are those which have the ability to have
hydrogen bonds .ethanol has that capacity .but other are not .hence
exept the remaing are polar aprotic solvents
