Question

The number of pi electrons present in naphthalene is

• A. $6$
• B. $10$
• C. $5$
• D. $12$

Answer 1

The correct option is B

$10$

The explanation for the correct option

(B) 10

pi bond

• “In the formation of π bond, the atomic orbitals overlap in such a way that their axes remain parallel to each other and perpendicular to the internuclear axis.”

• Single bonds consist of one sigma (σ) bond, double bonds have one σ and one pi (π) bond.
• The total pi bond in naphthalene is five.
• So, the number of pi electrons present in naphthalene is $5\times 2=10$.

The explanation for the incorrect option

• The number of pi electrons present in naphthalene is $10$. Hence, options (A), (C), and (D) are incorrect.

Hence, option B is correct.