Organic Chemistry
Organic Chemistry
8th Edition
ISBN: 9781305580350
Author: William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher: Cengage Learning
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Chapter 5, Problem 5.32P
Interpretation Introduction

Interpretation:

Index of hydrogen deficiency has to be calculated for β- carotene and lycopene.

Concept Introduction:

Index of hydrogen deficiency in a molecule is the total number of rings and π- bonds.

Index of hydrogen deficiency=(Hreference Hmolecule)2where,Hmolecule= Number of hydrogens in the given molecule.Hreference=Number of hydrogens in the acyclicalkane  having same number of carbon atoms(CnH2n+2).

The molecular formula of the reference hydrocarbon has to be adjusted if atoms other than carbon and hydrogen are present.

  • • If Group 7 elements like F, Cl, Br, I is present, then the halide atom is replaced by hydrogen. For example, the molecular formula of the acyclic monochloroalkane is CnH2n+1Cl, then the molecular formula should be taken as CnH2n+2.
  • • If Group 6 elements like O, S, Se are present, then there is no change in the molecular formula.
  • • If Group 5 elements like N, P, As are present, then one hydrogen should be added to the molecular formula.

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