Analyzing Mass Spectrum, telling isotope distribution I have this compound of 1-

Question

Analyzing Mass Spectrum, telling isotope distribution

I have this compound of 1-bromohexane,
Ive attacehd the mass spec.
can someone please tell me what the parent ions each peak represents, because i know the molar mass of 1-bromohexane is 165.07g/mol, so what do these other peaks represent? which parent ions?

Line#: R.T me: 4.8(Scan#:340) Mass Peaks 10 Raw Mode: Averaged 4.8-4.9(334-347) BasePeak 85(515293) BG Mode Averaged (438-817) Group 1 Event 1 90 80 70 60 50 40 107 120 100 110 Spectrum 135 130 140 150 160 170 180

Explanation / Answer

The Ms of bromo compound show two characteristic peaks one for each isotope 79 & 81. -   51 % & 49% each.

CH3-CH2-CH2-CH2-CH2-CH2-Br -   shows peak --164 / 166 [ two isotope mass ]

CH2-CH2-CH2-CH2-Br - shows peak - 135 / 137 [ two isotope mass ]   - CH3-CH2- minus 29

CH2-CH2-Br - shows peak - 107 / 109 [ two isotope mass ]   - CH2-CH2- minus 28

All the above fragments show two peaks for bromo isotopes

CH3-CH2-CH2-CH2-CH2-CH2   shows peak --85 [ NO two isotope mass as no bromo present ]

CH3-CH2-CH2-CH2-CH2-CH2: - ve charge shows peak --86 [NO two isotope mass as no bromo present and the compound contains additional lone pair and negative charge] Not sure of this last value though.

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