Question

Assertion (A): Carbon has a strong tendency to either lose or gain electrons to attain noble gas configuration.

Reason (R): Carbon has four electrons in its outermost shell and has the tendency to share electrons with carbon or other elements.

• A. Both (A) and (R) are true and (R) is correct explanation of the assertion (A)
• B. Both (A) and (R) are true, but (R) is not the correct explanation of the assertion (A)
• C. (A) is true, but (R) is false
• D. (A) is false, but (R) is true.

Answer 1

The correct option is D

(A) is false, but (R) is true.

Explanation for the correct answer:-

Option (D) (A) is false, but (R) is true.

• Carbon has a valency of four as it has 4 electrons in its outermost shell, $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^2$.
• Thus it needs 4 more electrons, to achieve the octet state.
• Carbon cannot lose or gain 4 electrons to do so because it would need a lot of energy to either gain or lose 4 electrons.
• Instead it shares its electron with another carbon or with other elements and attains octet state.
• In this manner it forms a covalent bond with itself or other elements.
• Thus the Assertion (A) is false but the Reason (R) is true.

Therefore, option (D) (A) is false, but (R) is true. is the correct answer.