A compound with molecular formula C₄H₄O has all the four carbon atoms and the oxygen atom in the ring. It also has two alternate double bonds. The compound is

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Homocyclic and aromatic

Heterocyclic and aromatic

Homocyclic but not aromatic

Heterocyclic but not aromatic

answer is B.

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Heterocyclic means, the ring is made up of by carbons and one (or) more hetero atoms.

According to Huckels Rule,

Monocyclic, planar ,conjugated polyenes having $[4n + 2]prod {}$ delocalised electrons are said to be AROMATIC.

The above compound is aromatic and heterocyclic.

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