3
Question
Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride?
Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride?
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Solution
The correct option is D
a) 
b)
c) 
d)
In option (d), seven membered cyclic anhydride is formed which is highly unstable. It further degrades to cyclopentanone which is stable. Because the seven-membered anhydride formed is unstable, so the reaction is least likely to occur. So, the correct answer is “Option d”.
a)
b)c)
d) In option (d), seven membered cyclic anhydride is formed which is highly unstable. It further degrades to cyclopentanone which is stable. Because the seven-membered anhydride formed is unstable, so the reaction is least likely to occur. So, the correct answer is “Option d”.
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