Consider the heating of the dicarboxylic acids given below:
Which of the following correctly represents the major products (P) and (Q) formed above?
P and Q are both anhydrides
P is an anhydride while Q is a cyclic ketone
P is an aldehyde while Q is a ketone
P and Q are both ketone
Succinic acid forms the 5-membered cyclic anhydride as shown
Adipic acid on the other hand does not form the anhydride which would have been 7 membered ring. Instead, it undergoes loss of CO2 as well as H2O to form a cyclic ketone as shown
So, P is an anhydride while Q is a cyclic ketone
The correct option is 2
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