Which compound forms hydrogen bonds in the liquid state?

A.     ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}{\text{OH}}$

B.     ${\text{CHC}}{{\text{l}}_{\text{3}}}$

C.     ${\text{C}}{{\text{H}}_{\text{3}}}{\text{CHO}}$

D.     ${{\text{(C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{)}}_{\text{3}}}{\text{N}}$

A

One respondent stated that there are two correct answers to this question, namely A. and C. This is incorrect as C. is ${\text{C}}{{\text{H}}_{\text{3}}}{\text{CHO}}$ which is an aldehyde, and this does not form hydrogen bonding between its molecules. Hence the only correct answer is A. ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}{\text{OH}}$.