The mass spectrum of a dihalo compound shows peaks with relative intensities of 1:2:1 corresponding to M, M+2… · ABC26OR0690
Subject: Organic Chemistry · Chapter: Reagents, Reaction Mechanisms & Named Reactions · Topic: Reagents, Reaction Mechanisms & Named Reactions – General · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Medium
The mass spectrum of a dihalo compound shows peaks with relative intensities of $1:2:1$ corresponding to $\mathrm{M}$, $\mathrm{M}+2$ and $\mathrm{M}+4$ ($\mathrm{M}$ is the mass of the molecular ion), respectively. The compound is
(a)
(b)
(c)
(d)
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Two bromines (⁷⁹Br/⁸¹Br ≈ 1:1) give M : M+2 : M+4 = 1 : 2 : 1 — the dibromotoluene (a); two Cl would give 9 : 6 : 1 and Br + Cl gives 3 : 4 : 1.
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