A compound with a peak in the mass spectrum at m/z 265 shows a 1:1 ratio between the molecular ion at 265 m/z and another ion seen at 267 m/z. the molecular formula is therefore ________.

An analytical technique used to measure the mass to charge ratio of the ions is known as mass spectrometry. This is one of the best technique used to analyse the structure of a molecule. It is used in a a lot of applications such as carbon dating, food contamination detection, isotope detection, protein identification etc.

We have given that,

molecular ion at 265 m/z

another ion seen at 267 m/z

their ratio is 1:1

C₁₃H₉Cl₂ON₁ in this in here Cl have two isotopes that are

36 and 37 but m/z is not equal to 265

in here C₁₂H₁₂BrO₁N₁ Br have two isotopes

Br-79, Br-81 and m/z equals to 256 and 257

so the molecular formula is therefore C₁₂H₁₂BrO₁N₁

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your question is incomplete, below you will find the missing content

here the options are not given, so options are

a. C₁₃H₉Cl₂ON₁ b. no isotopic atom c. C₁₂H₁₂BrO₁N₁