Question

Which of the following are correct statements?

(A) Hydrogen bond is weaker than covalent bond.
(B) CH\(_4\) has covalent bonds.
(C) Covalent compounds do not conduct electricity except diamond.
(D) Graphite is a soft solid and a good conductor of electricity.
Choose the correct answer from the options given below:

• A. (A), (B) and (D) only.
• B. (A), (B) and (C) only.
• C. (A), (B), (C) and (D).
• D. (B), (C) and (D) only.

Hint:

Hydrogen bonds are weaker than covalent bonds. Graphite is soft and conductive, while covalent compounds generally do not conduct electricity.

Answer 1

The Correct Option is A

Step 1: Hydrogen Bonding.
- Hydrogen bonds are weaker than covalent bonds, representing an attraction between a hydrogen atom bonded to an electronegative atom (e.g., oxygen, nitrogen) and another electronegative atom.
Step 2: Covalent Bonding in CH\(_4\).
- Methane (CH\(_4\)) features covalent bonds between its carbon and hydrogen atoms.
Step 3: Conductivity of Covalent Compounds.
- Generally, covalent compounds are non-conductive unless molten or dissolved. Diamond, a covalent network solid, is a non-conducting exception.
Step 4: Graphite Properties.
- Graphite is a soft, electrically conductive solid due to mobile electrons between its layers.
Step 5: Conclusion.
Therefore, the accurate statements include:
- Hydrogen bonds are weaker than covalent bonds.
- CH\(_4\) contains covalent bonds.
- Graphite is a soft solid and a good electrical conductor.
Final Answer: \[ \boxed{\text{(A), (B) and (D) only}} \]