Question

Acetic anhydridereacted with perchloric acid, to avoid formation of coohyl perchlorate

Answer 1

However, dangerous anhydrous perchloric acid can form when an aqueous solution is subjected to strong dehydrating conditions such as exposure to concentrated sulfuric acid, acetic anhydride, or phosphorous pentoxide

Answer 2

Perchloric acid is one of the strongest acids known. ... However, dangerous anhydrous perchloric acid can form when an aqueous solution is subjected to strong dehydrating conditions such as exposure to concentrated sulfuric acid, acetic anhydride, or phosphorous pentoxide