In the mass spectrum of dodecahedron (C₂₀ H₂₀), approximate ratio of the peaks at m / z=260 and 261 is

Q72 · CSIR-NET Chemistry, December 2011

Paper: CSIR-NET December 2011 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: Mass Spec · Marks: 2 · Difficulty: Medium

In the mass spectrum of dodecahedron $\left(\mathrm{C}_{20} \mathrm{H}_{20}\right)$, approximate ratio of the peaks at $m / z=260$ and 261 is

(a)$1: 1$

(b)$5: 1$

(c)$10: 1$

(d)$20: 1$

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

The M+1 peak of a C₂₀ compound is ≈ 20 × 1.1 % = 22 % of M, so 260 : 261 ≈ 5 : 1.

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