Which of the following statements are incorrect for carbon compounds ?
(a) Most carbon compounds are good conductor of electricity.
(b) Most carbon compounds have ionic bonds.
(c) Force of attraction between molecules of carbon compounds is not very strong.
(d) Methanol, acetic acid and acetone are carbon compounds.

Question

Which of the following statements are incorrect for carbon compounds ? 
(a) Most carbon compounds are good conductor of electricity. 
(b) Most carbon compounds have ionic bonds. 
(c) Force of attraction between molecules of carbon compounds is not very strong. 
(d) Methanol, acetic acid and acetone are carbon compounds.

Accepted Answer

Option 3 is the correct answer because statements (a) and (b) are incorrect for carbon compounds. Let's examine each statement to understand why:

1. **Statement (a): "Most carbon compounds are good conductors of electricity."**
   - This statement is incorrect. Most carbon compounds are covalent in nature, meaning they share electrons rather than transferring them as in ionic compounds. Covalent compounds generally do not have free ions or electrons to conduct electricity. Therefore, most carbon compounds are poor conductors of electricity. Exceptions exist, such as graphite, but these are not the norm.

2. **Statement (b): "Most carbon compounds have ionic bonds."**
   - This statement is also incorrect. Carbon compounds predominantly form covalent bonds, where electrons are shared between atoms. Ionic bonds, which involve the transfer of electrons from one atom to another, are not common in carbon compounds. Carbon's ability to form four covalent bonds is a fundamental aspect of organic chemistry.

3. **Statement (c): "Force of attraction between molecules of carbon compounds is not very strong."**
   - This statement is generally correct. The intermolecular forces in carbon compounds, such as van der Waals forces or hydrogen bonds, are typically weaker than the ionic or metallic bonds found in other types of compounds. This is why many carbon compounds have relatively low melting and boiling points.

4. **Statement (d): "Methanol, acetic acid and acetone are carbon compounds."**
   - This statement is correct. Methanol (CH₃OH), acetic acid (CH₃COOH), and acetone (C₃H₆O) are all well-known carbon compounds. They contain carbon atoms bonded to other elements such as hydrogen and oxygen, forming covalent bonds.

**Explanation of Other Options:**

- **Option 1: (a) and (d)**
  - This option is incorrect because statement (d) is true. Methanol, acetic acid, and acetone are indeed carbon compounds.

- **Option 2: (c) and (d)**
  - This option is incorrect because both statements (c) and (d) are true. The force of attraction between molecules of carbon compounds is not very strong, and methanol, acetic acid, and acetone are carbon compounds.

- **Option 4: (b) and (d)**
  - This option is incorrect because statement (d) is true. While statement (b) is incorrect, statement (d) correctly identifies methanol, acetic acid, and acetone as carbon compounds.

In conclusion, Option 3 is the correct answer because it accurately identifies statements (a) and (b) as incorrect descriptions of carbon compounds.