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Why is it more difficult to recrystallize benzil when using hexane as a solvent instead of ethanol?

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

Section21.1: Introduction To Hydrocarbons

Problem 5SSC

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Question

Why is it more difficult to recrystallize benzil when using hexane as a solvent instead of ethanol?

Expert Solution

Step 1

Recrystallization is a process of purifying compounds by dissolving the crude sample of the given compound in a suitable solvent by heating it, and then letting the saturated solution to cool down slowly till the pure compound separates out as crystals.

Benzil has the structure -

Benzil normally exists in trans form with its two carbonyl groups in opposite direction as it is less hindered.

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