Draw structures for the two fragment ions of highest mass from the following molecule

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Draw structures for the two fragment ions of highest mass from the following molecule.

What is the molecular formula of a hydrocarbon with M⁺ = 108? (Write the formula with no subscripts, e.g. C4H10.)

What is the sum of rings and double bonds in this compound?

The "nitrogen rule" of mass spectrometry requires a compound containing an odd number of nitrogens to have an odd-mass molecular ion and a compound containing an even number of nitrogens to have an even-mass molecular ion.

What is the molecular formula of the CHN-containing compound pyrazine, M⁺ = 80?

Draw the structure of the McLafferty rearrangement fragment that the following compound will produce during mass spectrometry:

Give one fragment in the mass spectrum and one peak in the IR spectrum that could be used to distinguish between these two isomers:

(Designate which compound will show that diagnostic fragment or peak by preceding the value with the letter of the compound, i.e. "a47" or "b1730". Do not include any units.)