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(A) $4$-pyrone contains a carbonyl group $(C=O)$ and an ether oxygen atom in the ring. When it reacts with an acid $(H^+)$,the lone pair on the carbon

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(A) $4$-pyrone contains a carbonyl group $(C=O)$ and an ether oxygen atom in the ring. When it reacts with an acid $(H^+)$,the lone pair on the carbonyl oxygen atom attacks the proton because the resulting cation is stabilized by resonance,leading to an aromatic pyrylium ion structure. This makes the carbonyl oxygen the site of protonation.

On reaction with acid,$4$-pyrone gives a very stable cationic product. Which of the following structures shows the protonation site in that product?

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On reaction with acid,$4$-pyrone gives a very stable cationic product. Which of the following structures shows the protonation site in that product?

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Classify the following species as Nucleophilic or Electrophilic:
$NO_2^+$,$OH^{-}$,$CH_3NH_2$,$NH_3$,$Br^{+}$,$CH_3-CO^{-}-CH_3$