• Support PF! Buy your school textbooks, materials and every day products Here!

Which substance exhibits the most hydrogen bonding?

  • Thread starter Bipolarity
  • Start date
  • #1
775
1

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
 

Answers and Replies

  • #2
Ygggdrasil
Science Advisor
Insights Author
Gold Member
2019 Award
2,947
2,125
In a hydrogen bond, you must have a hydrogen bond donor and a hydrogen bond acceptor. The donor requires a hydrogen covalently bound to either a fluorine, nitrogen or oxygen. The hydrogen bond acceptor requires a lone pair on a fluorine, nitrogen or oxygen.

Compound A is capable of acting as a hydrogen bond acceptor, but because the hydrogens are bound to the carbon, it is incapable of acting as a hydrogen bond donor.
 

Related Threads for: Which substance exhibits the most hydrogen bonding?

Replies
1
Views
11K
  • Last Post
Replies
10
Views
8K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
4
Views
2K
Replies
4
Views
47K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
7
Views
10K
  • Last Post
Replies
4
Views
14K
Top