Chemistry QUESTION

[imanmalik]

Which of the following has dipole-dipole interactions between its molecules, but no​

hydrogen bonding?​

A Methane, CH4​

B Methanol, CH3OH​

C Ammonia, NH3​

D Hydrogen iodide, HI​

the answer is D​

how can it be D? I know the 2 have permanent dipoles and form Hydrogen bonds . A has no dipole. but how is it D?​

 

[XPFMember]

Which of the following has dipole-dipole interactions between its molecules, but no​

hydrogen bonding?​

A Methane, CH4​

B Methanol, CH3OH​

C Ammonia, NH3​

D Hydrogen iodide, HI​

the answer is D​

how can it be D? I know the 2 have permanent dipoles and form Hydrogen bonds . A has no dipole. but how is it D?​

Assalamoalaikum wr wb!!

well A is wrong cuz it only has Van der waals forces..

b and c have hydrogen bonding..

d has dipole-dipole but no hydrogen bondding

 

[imanmalik]

But why isnt the I-H-----I-H called hydrogen bonding?

 

[XPFMember]

But why isnt the I-H-----I-H called hydrogen bonding?

nopes...hydrogen bonding is in the presence of -OH groups, NH3 , in HF...

 

[imanmalik]

Although one might expect hydrogen bonding to occur between Hl molecules. However, Iodine is too large, and thus the lone pairs are too diffuse ie. not concentrated enough, and hence hydrogen bond attractions between l's lone pairs and hydrogen atoms can not form.

 

[smzimran]

Iodine molecule is not very electronegative,
Just remember that h.b takes place with NOF only
N = nitrogen
O = oxygen
F = flourine
Hope that will help