279% c a compound uiai com d. an ami de that has a molecular ion with an m/z val

Question

279% c a compound uiai com d. an ami de that has a molecular ion with an m/z value of 115 PROBLEM 6 Iacompound has a molecular ion with an odd-numbered mass, then the molecular ion with an odd-numbered mass, then the compound contains ar a compound has a odd number of nitrogen atoms. This is known as the nitrogen rule. a Calculate the m/z value for the molecular ion of each of the following compounds: h. Explain why the nitrogen rule holds. c. State the rule in terms of a molecular ion with an even-numbered mass. PROBLEM 7 a. Suggest possible molecular formulas for a compound that has a molecular ion with an m/z value of 86 h. Can one of the possible molecular formulas contain a nitrogen atom?

Explanation / Answer

ANSWER
The rule is derived from the fact that in organic compounds elements with even mass form even number of bonds and elements with odd mass form odd number of bonds. But nitrogen is exception, it has mass of 14 and forms three bonds. That is the reason why nitrogen rule holds. The rule is applicable to neutral molecules only. for example if we have one nitrogen. It can form three bonds. If all bonds are formed with Hydrogen, molecular mass will be 3 + 14 = 17. If it is bonded to three carbons the compound will have three carbon atoms and nine hydrogen atoms. Because each carbon will three bonds with three hydrogens and one bond with N. So molecular mass will be = 3 X Mol. mass of carbon + 9 X Mol. mass of H + Mol. mass of N = 3 X 12 + 9 X 1 + 14 = 59.

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