Which of the following statements are TRUE for hydrogen bonds? Strength of hydrogen bond is
(1) high in a solvent of high dielectric constant
(2) low in a solvent of low dielectric constant
(3)lower in water as compared to organic solvents
(4) higher in water as compared to organic
Hydrogen bond strength is influenced by the dielectric constant of the surrounding solvent. Let’s analyze each statement:
- High in a solvent of high dielectric constant – False
- A solvent with a high dielectric constant (like water) weakens hydrogen bonds because it stabilizes the separated charged species and competes with hydrogen bonding interactions.
- Low in a solvent of low dielectric constant – False
- In solvents with a low dielectric constant (like organic solvents), hydrogen bonds tend to be stronger because there is less competition from solvent molecules.
- Lower in water as compared to organic solvents – True
- Water has a high dielectric constant and forms strong hydrogen bonds with itself, weakening other hydrogen bonds. Organic solvents usually have a lower dielectric constant, making hydrogen bonds stronger in them.
- Higher in water as compared to organic solvents – False
- As explained above, hydrogen bonds are weaker in water than in most organic solvents.
Correct Answer: (3) Lower in water as compared to organic solvents
