Q3 / 75 · JEE Main 2026 (05 April Shift 2) · Chemistry
The covalent radii of atoms A and B are $r_A$ and $r_B$, respectively. The covalent bond length and total length of AB molecule are respectively
- Correct answerA$(r_A + r_B), 2(r_A + r_B)$
- B$\dfrac{1}{2}(r_A + r_B), (r_A + r_B)$
- C$(r_A + r_B), (r_A + r_B)$
- D$2(r_A + r_B), \dfrac{1}{2}(r_A + r_B)$
Solution
The covalent bond length of the AB molecule is the internuclear distance between atom A and atom B.
Bond length = $r_A + r_B$
The total length of the AB molecule is the distance between the outermost boundaries of the two atoms along the internuclear axis.
Total length = Radius of A + Bond length + Radius of B
Total length = $r_A + (r_A + r_B) + r_B = 2(r_A + r_B)$
Answer: $(r_A + r_B), 2(r_A + r_B)$
Bond length = $r_A + r_B$
The total length of the AB molecule is the distance between the outermost boundaries of the two atoms along the internuclear axis.
Total length = Radius of A + Bond length + Radius of B
Total length = $r_A + (r_A + r_B) + r_B = 2(r_A + r_B)$
Answer: $(r_A + r_B), 2(r_A + r_B)$
Hence, the correct answer is option: 'A'.