can someone hleppppppppppppp

User Generated

unjn2

Science

Description

In which of the following compounds hydrogen bonding is an important intermolecular force? 

choose correct or incorrect

 NH3 
 H2
HCN 
 CH3CHO 

CH2

User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.

Explanation & Answer

NH3 has **ONE** lone pair 

each lone pair can "share" an H with another moleucle; ie form a H-bond


In order for hydrogen bonds to exist, there must be a hydrogen atom that is joined or bonded with either an oxygen, flourine or nitrogen atom. Hydrogen bonds cannot exist without either an oxygen, flourine or nitrogen atom in which a hydrogen atom cannot bond with.


The reasoning is that HCN cannot form hydrogen bonds because the hydrogen is not bound to an electronegative atom.(fluorine, oxygen or nitrogen) to produce a sufficiently polarised X-H bond. 

In ethanal (CH3CHO) all the hydrogens are bonded to carbon atoms...so no hydrogen bonding occurs.

CH2O, or formaldehyde, does not have hydrogen bond donors, ie. an acidic hydrogen, such as N-H, O-H, or F-H. BUT, it can accept hydrogen bonding, since the C=O bond is polar enough. So, if you put formaldehyde into something that can hydrogen bond, like water, the Hydrogens in the water can be hydrogen-bonded to the Oxygen in the formaldehyde, BUT the Hydrogens in the formaldehyde will NOT hydrogen bond to the Oxygens in the water.


Anonymous
Just the thing I needed, saved me a lot of time.

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4

Similar Content

Related Tags