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Why is it important to maintain the reaction temperature low and the addition of nitric acid-sulfuric...

Why is it important to maintain the reaction temperature low and the addition of nitric acid-sulfuric acid mixture carried out slowly?
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Answer #1

The reaction is maintained at a low temperature with slow addition of the HNO3/H2SO4 mixture to ensure that only one NO2 group is substituted into the benzene ring (i.e. mononitration).

If the temperature and nitronium ion (NO2+) concentration are too high (from quick addition of HNO3/H2SO4), then the chances of more than one NO2 group substituting into the benzene ring increases. This would give rise to unwanted dinitration products.

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