Question

Given the following molecular formulas calculate the elements of unsaturation for each compound. (4 points) C3H3N3 CsH5C1:0

Answer 1

Element of unsaturation or Index of Hydrogen deficiency or double bond equivalence: = [2( number of carbon atoms) -( number of monovalent atoms ) + ( number of trivalent atoms) +2] /2

a) = (2*3 -3 +3 +2)/2 = 4

This molecule can have four double bond or two triple bond or mixture of double / triple bond / ring.

b) = (2*5 -5 -3+2) /2 = 2

This can have two double bonds or 1 triple bond or 1 double bond + 1 ring