Compare the refractive indices of hexane and its branched isomers. What effect does branching have on refractive index values? Do isomers have the same refractive index values? Compound Number of carbon atoms Experimental refractive index (average from class data) Theoretical refractive index Pentane 5 1.3580 1.3575 Hexane 6 1.3791 1.3727 3-methylpentane 6 1.3762 1.3765 2,3-dimethylbutane 6 1.3753 1.3570 Heptane 7 1.3870 1.3855 Octane 8 1.3984 1.3944

Compare the refractive indices of hexane and its branched isomers. What effect does branching have on refractive index values? Do isomers have the same refractive index values? Compound Number of carbon atoms Experimental refractive index (average from class data) Theoretical refractive index Pentane 5 1.3580 1.3575 Hexane 6 1.3791 1.3727 3-methylpentane 6 1.3762 1.3765 2,3-dimethylbutane 6 1.3753 1.3570 Heptane 7 1.3870 1.3855 Octane 8 1.3984 1.3944

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter14: Ultraviolet Spectroscopy, Refractive Indices, And Qualitative Instrumental Organic Analysis

Section: Chapter Questions

Problem 5Q

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How does the number of carbon atoms correlate to the refractive index? How about in the case of branched isomers?
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For a simple distillation: Compound Number of carbon atoms Experimental refractive index (average from class data) Theoretical refractive index Pentane 5 1.3580 1.3575 Hexane 6 1.3791 1.3727 3-methylpentane 6 1.3762 1.3765 2,3-dimethylbutane 6 1.3753 1.3570 Heptane 7 1.3870 1.3855 Octane 8 1.3984 1.3944 a) Compare the refractive indices of the straight chain alkanes. What effect does chain length have on refractive index? b)Compare the refractive indices of hexane and its branched isomers. What effect does branching have on refractive index values? Do isomers have the same refractive index values?
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Compound	Number of carbon atoms	Experimental refractive index (average from class data)	Theoretical refractive index
Pentane	5	1.3580	1.3575
Hexane	6	1.3791	1.3727
3-methylpentane	6	1.3762	1.3765
2,3-dimethylbutane	6	1.3753	1.3570
Heptane	7	1.3870	1.3855
Octane	8	1.3984	1.3944