Question

18. Answer yes or no. Which of the following pairs of substances are held together by hydrogen bonding(answer yes for hydrogen bond, answer no for not a hydrogen bond).

A. alcohol and KCL

B. water and ammonia

C. Acetone and gasoline

D. water and oil

E. alcohol and gasoline

F. water and alcohol

Answer 1

H bonding is shown by covalent compound with polarity which can be formed within molecules
[intra molecular H bond} or between molecules{intermolecular}.
it is a weak force of attraction between H atom and an electronegative atom {like O or F}.Only polar covalent compound forms H bonding

A.Alcohol and KCl .there is no hydrogen bonding,because KCl is an
ionic comp0und ,there wont be any intermolecular force of attraction

A.No

B.Water and NH3 can form hydrogen bonding between H of ammonia
molecule and electronegative oxygen of water molecule.

B.Yes

C.Acetone and gasoline.

Acetone can accept H bonding with its carbonyl O atom . But gasoline is a
non polar covalent compound so it unable to attract charged species.

C.No
D. Oil is a no polar covalent compound .So it is unable to
form H.bond with water molecule

D.No

E.alcohol and gasoline
As Gasoline is a nonpolar covalent compound.it wont form H bond with alcohol

E.No

F.water and alcohol
both alcohol and water are polar covalent compounds.Hence they form intermolecular H bonds

F.yes

hope it is clear thank you!