General, Organic, and Biological Chemistry - 4th edition
General, Organic, and Biological Chemistry - 4th edition
4th Edition
ISBN: 9781259883989
Author: by Janice Smith
Publisher: McGraw-Hill Education
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Chapter 15, Problem 55P
Interpretation Introduction

(a)

Interpretation:

Whether lactose is dextrorotatory or levorotatory compound should be determined.

Concept Introduction:

Chiral or optically active molecules can rotate plane-polarized light either clockwise or counter clockwise. If plane-polarized light is rotated clockwise then it is known as dextrorotatory and for counter clockwise rotation it is known as levorotatory.

Interpretation Introduction

(b)

Interpretation:

Specific rotation of the enantiomer of lactose should be determined.

Concept Introduction:

Enantiomers rotate the plane-polarized light in opposite directions by same angle.

Interpretation Introduction

(c)

Interpretation:

The amount of lactose enantiomer dissolved in water should be determined.

Concept Introduction:

Physical properties of enantiomers are similar except the direction of optical activity. Solubility, melting point, boiling points are similar.

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Students have asked these similar questions
The specific rotation (s) carvone (at 20°C) is +61. A chemist prepared a mixture of (R) carvone and its enantiomer, and this mixture had an observed rotation of -55. What is the specific rotation of (R)-carvone at 20°C?
The specific rotation of (R)carvone is -61o. A chemist prepared a mixture of (R)-carvone and (S)-carvone, and the mixture had an observed rotation of -47o. What is the % enantiomeric excess (ee) of the mixture?
A certain compound has a specific rotation of -43.2o (c = 5, toluene). What is the observed rotation of a sample of 1.24 g of the enantiomer of this compound when diluted to a concentration of 1.00 g ml-1 in the same solvent? Example 30 In his classic studies of stereochemistry and optical activity in organic compounds, Pasteur measured the optical activity of many solutions. For the naturally occurring enantiomer of tartaric acid, [α]D20 = +12.4o (c = 20, H2O). What can be concluded about the ratio of tartaric acid enantiomers present in the solution if the observed rotation is (i) α = -6.0o, or (ii) α =  0o?

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General, Organic, and Biological Chemistry - 4th edition

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