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

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Why is it more difficult to recrystallize benzil when using hexane as a solvent instead of ethanol? 

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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 -

Chemistry homework question answer, step 1, image 1

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

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