Intermolecular Hydrogen Bonding?

Question

For which molecule in each of the following pairs would you expect stronger hydrogen bonding?

* are my answers
1)
A)(CH3)2CO
B)(CH3)2CHOH *

2)
A)HBr
B)HF *

3)
A)H3PO4 *
B)PH3

4)
A) C2O4H2 *
B) (CH2OH)2

Answer 1

for number one its (b).
for number two its (b)
for number three its (a)
for number four its (a)

Answer 2

Your answers are all correct except for #4, it should be B I think. Remember Hydrogen Bonding only occurs when the Hydrogen is bonded to Nitrogen, Oxygen, or Florine.

Answer 3

4 foot 1

Answer 4

dude i dont think ur gonna get a serious anwser from that question the only peeps that use this is jack asses just screwing around but if i remember right from chemistry the strongest bond is #3 but im not positive

Answer 5

Your answers are correct.

4a corresponds to oxalic acid and of course the H-bonding is stronger than in the respective diol.