1) Index of hydrogen deficiency (IHD) aka Degree of Unsaturated is a calculation formula to determine the total number of double bonds, triple bonds and rings in a given chemical formula. IHD (2n+2)-H+N-X 2 where n = # of Carbons; X= # of halogens; N-nitrogen; H= Hydrogens Rules: I. Ignore oxygens in the formula II. Halogens count as hydrogens III. IHD 1 1 double bond, ring, carbonyl, N=O, C=N, etc. IV. IHD 2 for a triple bond, 2 double bonds, double bond and a ring or 2 rings Determine IHD for the following: a) C10H20O b) C6H9N c) C7H14F2 d) C6H8CIN e) C9H15NO