. Does chlorophyll a or chlorophyll b have a greater number of “conjugated” double bonds, or do they have the same number? Draw the structure of chlorophyll b and using a colored highlighter, indicate which of the double bonds are “conjugated”.

. Does chlorophyll a or chlorophyll b have a greater number of “conjugated” double bonds, or do they have the same number? Draw the structure of chlorophyll b and using a colored highlighter, indicate which of the double bonds are “conjugated”.

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter21: Hydrocarbons

Section: Chapter Questions

Problem 38A

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Concept explainers

Alkanes and Cycloalkanes

Alkanes are saturated organic compounds which are made up of C and H atoms. Alkanes have the general formula of CnH2n+2. Alkane contains sp3 hybridized carbon atoms with four sigmas (σ) bonds & every hydrogen atom is connected with one of the carbon atoms. The size of the alkane could be determined by the number of carbon atoms located in it.

Question

1. Does chlorophyll a or chlorophyll b have a greater number of “conjugated” double bonds, or do they have the same number? Draw the structure of chlorophyll b and using a colored highlighter, indicate which of the double bonds are “conjugated”.

2. What is the main functional group in THF (tetrahydrofuran)? Is THF more polar or less polar than IPA (also called: isopropyl alcohol, isopropanol, or 2-propanol)?

3.If you mistakenly used hexanes-THF (2:1) for eluting the carotene pigments from your chromatography column, will they elute faster or slower than if you had correctly used hexanes-THF (10:1)? Explain

Definition Definition Group of atoms that shape the chemical characteristics of a molecule. The behavior of a functional group is uniform in undergoing comparable chemical reactions, regardless of the other constituents of the molecule. Functional groups aid in the classification and anticipation of reactivity of organic molecules.

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