Chemistry question plz help?

Question

In which of the following substances is hydrogen bonding likely to play an important role in determining physical properties and why: Methane (Ch4), Hydrazine(H2NNH2), Methyl Fluoride (Ch3F) or Hydrogen Sulfide(H2S) ?? And why??

Thanks in advance

Answer 1

Hydrazine, because the electronegativity of N is a high 3.0, so it will be slightly ngatively charged and attract the slightly positively charged H. The electronegativity of S is too low to give this effect. In CH3F and CH4, the electronegativities of C and H are too similar to give a charged H.

Answer 2

H2S me forgets y lol :P hey i only have a 76 in that class what can i say