Question

Which of the following statements are usually correct for carbon compounds?

(i) are good conductors of electricity

(ii) are poor conductors of electricity

(iii) have strong forces of attraction between their molecules

(iv) do not have strong forces of attraction between their molecules

• A. (i) and (iii)
• B. (ii) and (iii)
• C. (i) and (iv)
• D. (ii) and (iv)

Answer 1

The correct option is D

(ii) and (iv)

Explanation for the correct options:

(D) (ii) and (iv)

• (ii)carbon are poor conductor of electricity - Carbon has been found in the covalent form in nature and its free electron has been used for their covalent bond so carbon is a poor conductor of electricity. Exception of graphite can be considered which is the allotrope of carbon and it is good conductors of electricity.
• (iv)Carbon does not have strong forces of attraction between their molecule - For carbon accepting and donating four electrons is difficult, so carbon forms only covalent bonds and this covalent bond is weaker than the ionic bond. Exception of the allotropic form of carbon known by the name diamond can also be considered which is the hardest substance on the nature.

Explanation for the incorrect options:

(A)(i) and (iii)

• (i)Carbon are good conductor of electricity- Carbon has been found in the covalent form in nature and its free electron has been used for their covalent bond so carbon is a poor conductor of electricity.
• (iii)Carbon has strong forces of attraction between its molecules - For carbon accepting and donating four electrons is difficult, so carbon forms only covalent bonds and this covalent bond is weaker than the ionic bond.

(B)(ii) and (iii)

• (ii)carbon are poor conductor of electricity - it is a correct option.
• (iii)Carbon has strong forces of attraction between its molecules - For carbon accepting and donating four electrons is difficult, so carbon forms only covalent bonds and this covalent bond is weaker than the ionic bond.

(D)(i) and (iv)

• (i)Carbon are good conductor of electricity- Carbon has been found in the covalent form in nature and its free electron has been used for its covalent bond so carbon is a poor conductor of electricity.
• (iv)Carbon does not have strong forces of attraction between their molecule - it is a correct option.

Hence, option (D) is correct., carbon is a poor conductor of electricity and does not have strong forces of attraction between its molecules is usually correct for carbon compounds.