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## Homework Statement

Which of the following substances exhibits significant hydrogen bonding in the liquid state?

A) [itex] CH_{2}F_{2} [/itex]

B) [itex] N_{2}H_{4} [/itex]

C) [itex] CH_{3}OCH_{3} [/itex]

D) [itex] C_{2}H_{4} [/itex]

E) [itex] C_{2}H_{2}[/itex]

## Homework Equations

## The Attempt at a Solution

I know that hydrogen bonding generally only works with hydrogen being attracted to a nonbonding pair on a very electronegative atom (N,F,O and Cl). So only A,B, and C can be the answer. The answer turns out to be B, but I really thought it would be A since flourine is the most electronegative.

I also don't understand whether being in the liquid state has any bearing on the problem.

Advice? Thanks for your time!

BiP