Under review — part of this question (a structure or an option) is not clear in the source scan. 4AB is checking it against the original book; the answer shown may change.
The $\mathrm{C}=\mathrm{O}$ bond length is 120 pm in $\mathrm{CO}_{2}$. The moment of inertia of $\mathrm{CO}_{2}$ would be close to (masses of C and O are $1.9 \times 10^{-27} \mathrm{kg}$ and $2.5 \times 10^{-27} \mathrm{kg}$, respectively)
(a)$1.8\times10^{-45}\,\mathrm{kg\,m^{2}}$
(b)$3.6\times10^{-45}\,\mathrm{kg\,m^{2}}$
(c)$5.4\times10^{-45}\,\mathrm{kg\,m^{2}}$
(d)$7.2\times10^{-45}\,\mathrm{kg\,m^{2}}$
Answer
Under review — not yet confirmed.
Answer: D
Explanation
CO₂: I = 2m_O r² = 2 × 2.5×10⁻²⁷ × (1.2×10⁻¹⁰)² = 7.2×10⁻⁴⁷ kg m² (option d; the printed exponent is a misprint).