Organic Chemistry, Binder Ready Version
Organic Chemistry, Binder Ready Version
2nd Edition
ISBN: 9781118454312
Author: David R. Klein
Publisher: WILEY
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Chapter 17, Problem 50PP
Interpretation Introduction

Interpretation:

The given compounds should be ranked in order or increasing λmax .

Concept introduction:

  • The π-systems of conjugated dienes absorb UV or visible light (200nm – 800nm).
  • The wavelength of maximum absorption of a compound is called λmax .
  • The value of λmax is highly depending on the extent of conjugation (number of conjugated double bonds).                                                                                                       Conjugated double bonds are the C=C bonds, which are separated by one σ-bond.
  • According to Woodward-Fieser rule, the estimate value of λmax for some conjugated compounds are given in below table,
COMPOUND λmax -value
Organic Chemistry, Binder Ready Version, Chapter 17, Problem 50PP , additional homework tip  1 217nm
Organic Chemistry, Binder Ready Version, Chapter 17, Problem 50PP , additional homework tip  2 258nm
Organic Chemistry, Binder Ready Version, Chapter 17, Problem 50PP , additional homework tip  3 290nm

To rank: the given compounds in order or increasing λmax ..

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