What information does the \"index of hydrogen deficiency\" provide from a mass s

Question

What information does the "index of hydrogen deficiency" provide from a mass spectrum?

a) It is an index used to calculate the number of hydrogen atoms on a compound before and after it has been run through a mass spectrometer.

b) It provides information concerning the number of rings plus the number of pi bonds in a molecule of a given compound.

c) It tells the number of hydrogen atoms bonded to oxygen in a given compound.

d)It gives the mass of the compound when all the hydrogen atoms have been removed.

Explanation / Answer

b) It provides information concerning the number of rings plus the number of pi bonds in a molecule of a given compound.

Formula IHD = 0.5 * [2c+2h-x+n] where c,h,n and x are carbon, hydrogen,nitrogen, and halogen respectively

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