1) Index of hydrogen deficiency (IHD) aka Degree of Unsaturated is a calculation

Question

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 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) CioH200O b) CsHoN c) C7Hi4F2 d) C6H8CIN e CoisNO

Explanation / Answer

Ans :

IHD of the following compounds can be calculated using the formula given in the question :

a) C10H20O :

IHD = [(2x10 + 2) -20] / 2 = 1

b) C6H9N :

IHD = [(2 x 6 + 2) - 9] + 1 / 2 = 3

c) C7H14F2 :

IHD : [(2 x 7 + 2) - 14] -2 / 2 = 0

d) C6H8ClN :

IHD : [(2 x 6 + 2 ) - 8] +1 -1 / 2 = 3

e) C9H15NO :

IHD = [(2 x 9 + 2) - 15] + 1 / 2 = 3

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