Questions on Hydrogen Bonding
Multiple-Choice Questions: Hydrogen Bonding
1. What is hydrogen bonding?
A) A strong covalent bond between hydrogen atoms
B) A weak ionic interaction
C) A special dipole-dipole interaction involving hydrogen and highly electronegative atoms
D) Metallic bonding involving hydrogen
E) Bonding between two hydrogen atoms only
2. Which atoms must hydrogen be directly bonded to in order to form a hydrogen bond?
A) Carbon, nitrogen, oxygen
B) Nitrogen, oxygen, fluorine
C) Fluorine, chlorine, bromine
D) Sulfur, phosphorus, oxygen
E) Nitrogen, sulfur, carbon
3. Which molecule exhibits hydrogen bonding?
A) CH₄
B) H₂O
C) CO₂
D) CCl₄
E) Ne
4. Which is the strongest hydrogen bond typically found in molecules?
A) H–C···O
B) H–O···N
C) H–N···F
D) H–F···O
E) H–F···N
5. Which element is NOT typically involved in hydrogen bonding?
A) Oxygen
B) Nitrogen
C) Fluorine
D) Chlorine
E) Hydrogen
6. In which of these molecules is hydrogen bonding NOT possible?
A) NH₃
B) HF
C) CH₄
D) H₂O
E) HCN
7. Hydrogen bonding contributes to which property of water?
A) Low boiling point
B) High boiling point
C) Low surface tension
D) Nonpolar behavior
E) Ionic character
8. Which of the following substances would have the highest boiling point due to hydrogen bonding?
A) CH₄
B) NH₃
C) H₂O
D) HF
E) CO₂
9. Hydrogen bonding causes which effect on the physical state of water at room temperature?
A) It remains a gas
B) It is a liquid
C) It is a solid
D) It forms a plasma
E) It becomes ionic
10. Which functional group commonly participates in hydrogen bonding in organic molecules?
A) Alkane
B) Hydroxyl (–OH)
C) Alkene
D) Alkyl halide
E) Ether
11. Which of these best describes the hydrogen bond donor?
A) Atom with lone pair accepting hydrogen bond
B) Hydrogen atom covalently bonded to electronegative atom donating the hydrogen bond
C) Hydrogen atom not involved in bonding
D) Any hydrogen atom
E) Atom without lone pairs
12. Which is TRUE about hydrogen bond acceptors?
A) They must be hydrogen atoms
B) They have lone pairs of electrons
C) They are always carbon atoms
D) They have no lone pairs
E) They are positively charged ions only
13. Hydrogen bonding is strongest when:
A) The hydrogen bond donor and acceptor are far apart
B) The donor atom is less electronegative
C) The donor and acceptor atoms are highly electronegative and close together
D) Hydrogen is bonded to carbon
E) The atoms involved are metals
14. Which of the following biological molecules relies heavily on hydrogen bonding for its structure?
A) Proteins
B) Salts
C) Metals
D) Hydrocarbons
E) Noble gases
15. DNA base pairing is stabilized by:
A) Ionic bonds
B) Covalent bonds
C) Hydrogen bonds
D) Metallic bonds
E) London dispersion forces
16. Which of the following liquids will exhibit hydrogen bonding?
A) CH₄
B) CCl₄
C) NH₃
D) He
E) Ne
17. Hydrogen bonding causes water to have:
A) A higher melting point than expected for its molecular weight
B) A lower boiling point than expected
C) No effect on melting or boiling points
D) A metallic nature
E) Low surface tension
18. Which of the following is NOT a requirement for hydrogen bonding?
A) A hydrogen atom bonded to N, O, or F
B) A lone pair on an electronegative atom
C) Close proximity of donor and acceptor atoms
D) Hydrogen bonded to carbon
E) Polar covalent bonds
19. Which statement about hydrogen bonds is correct?
A) Hydrogen bonds are stronger than covalent bonds
B) Hydrogen bonds are stronger than London dispersion forces but weaker than covalent bonds
C) Hydrogen bonds are a type of ionic bond
D) Hydrogen bonds occur only in gases
E) Hydrogen bonds form between any two atoms
20. Which property of water is a direct result of hydrogen bonding?
A) Low specific heat capacity
B) Expansion upon freezing
C) Nonpolar solvent properties
D) Poor solvent for ionic compounds
E) Low surface tension
Answers with Explanations
1. C) Hydrogen bonding is a special dipole-dipole interaction involving hydrogen and highly electronegative atoms (N, O, F).
2. B) Hydrogen must be bonded to N, O, or F to form hydrogen bonds.
3. B) H₂O shows hydrogen bonding due to O–H bonds and lone pairs on oxygen.
4. E) H–F···N bonds are very strong hydrogen bonds involving fluorine and nitrogen.
5. D) Chlorine is generally not involved in hydrogen bonding.
6. C) CH₄ does not have H bonded to N, O, or F; no hydrogen bonding.
7. B) Hydrogen bonding leads to water’s unusually high boiling point.
8. C) H₂O has very strong hydrogen bonding and high boiling point.
9. B) Hydrogen bonding keeps water liquid at room temperature.
10. B) Hydroxyl groups (–OH) commonly form hydrogen bonds.
11. B) Donor is H covalently bonded to an electronegative atom, donating H for bonding.
12. B) Acceptors have lone pairs to accept hydrogen bonds.
13. C) Strong hydrogen bonding requires highly electronegative atoms close together.
14. A) Proteins rely heavily on hydrogen bonding for folding and structure.
15. C) DNA base pairs are stabilized by hydrogen bonds between bases.
16. C) NH₃ exhibits hydrogen bonding due to N–H bonds and lone pairs.
17. A) Hydrogen bonding increases melting and boiling points.
18. D) Hydrogen bonded to carbon does NOT form hydrogen bonds.
19. B) Hydrogen bonds are stronger than dispersion forces but weaker than covalent bonds.
20. B) Water expands upon freezing due to hydrogen bonding creating an open lattice.
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