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Stoichiometry

Consider the ...

Question

Consider the following reaction:
Which of the above three acids, $I, I I,$ and $I I I$ forms anhydride on heating?

A

I

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B

II

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C

III

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D

All

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Solution

The correct option is A I
Phthalic acid (I) on heating forms phthalic anhydride as two carboxylic groups are in ortho position..

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