which exhibits hydrogen bonding (there can be more than 1)

Question

1. IF7
2. SiH4
3. CH3CH2OH
4. (CH3)2CHOH
5. PCl3
6. CH3CHCHCH3

* do you have any tips for figuring it out?

H bonding, by definition, takes place with H of one molecule and a highly electronegative atom (usually O, N, F) of another molecule. With that in mind, 1, 2, 5, and 6 are eliminated. That leave 3 and 4 to show H bonding. And alcohols have and O of one molecule and and H of another molecule of the same material.