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Question

Aside from concentrated sulphuric acid,what other acid is employed in the dehydration of alcohols?


A
Concentrated hydrochloric acid
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B
Conc.acetic acid
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C
Conc.phosphoric acid
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D
Conc.acetone
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Solution

The correct option is C Conc.phosphoric acid
Dehydration of alcohols using an acid catalyst
The acid catalysts normally used are either concentrated sulphuric acid or concentrated phosphoric(V) acid, $$H_3PO_4$$. Both of these are powerful oxidising agents.
Phosphoric(V) acid tends to be used in place of sulphuric acid because it is safer and produces a less messy reaction. Phosphoric(V) acid isn't a strong oxidising agent.

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Chemistry

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