Sapling week 5 & 6 #16

[Sarah Hernandez 1F]

I got this question right but I was mostly guessing, could someone explain why d was the right answer?

[Jason Nguyen_1B]

A hydrogen bond can only occur between a hydrogen and a nitrogen, oxygen, and fluorine atom. For a hydrogen to undergo hydrogen bonding, the hydrogen must first be covalently bonded to very electronegative atom (only N, O, and F). The second parameter is that the hydrogen must be close to another electronegative atom (N, O, and F) that has available lone pairs. D is correct because the hydrogen is first covalently bonded to a nitrogen. Next it is attracted to a very electronegative atom, in this case oxygen.

[Kaylee Messick 3J]

Carbon and hydrogen atoms have similar electronegativity values and therefore would share electrons equally. This means they would not form hydrogen bonds because the atoms do not have partial charges. This eliminates B,C,E, and F. Answer choice A does not have a hydrogen atom so it would not form a hydrogen bond. This leaves Answer D as the correct choice because difference in electronegativity values between O and C, and N and H allows them to have partial positive and negative regions that can interact. Hope this helps!

[Sarah Hernandez 1F]

Thanks Kaylee and Jason your explanations were really helpful!

[Shivani Kapur 2J]

The Hydrogen must be able to create a strong dipole moment to bond to an electronegative element therefore bonding to another electronegative element will allow for the electrons to be shared unequally and allow for Hydrogen bonding to occur.

[joshtully]

The answer is D because it is the only option that contains an H atom bonded between N, O, or F.

[Adam_ElSayed_3B]

The correct answer would be D because it is the only one that has has H connected to an O,N, and F molecule on each side.

[Adam_ElSayed_3B]

Why are O N and F atoms the only ones that bond with hyrdrogen for these types of problems ?