Which of the following structures would be aromatic ? (I) (II) (III) (IV)

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Chemistry - GOC Question with Solution | TestHub

ChemistryGOCAromaticityEasy2 minQB

ChemistryEasysingle choice

Which of the following structures would be aromatic ?

(I) structure

(II) structure

(III) structure

(IV) structure

Options:

Answer:

Solution:

(I) the potassium cycloheptatrienide anion has 8π : not aromatic. (II) the cyclooctatetraene dianion (with 2 $K^{+}$ ) has 10π, planar : aromatic. (III) the cyclopropenyl anion has 4π : anti-aromatic. (IV) the cyclobutenyl cation has one $s p^{3}$ carbon, so only 3 carbons are conjugated (an allyl cation) : not aromatic. Only (II) is aromatic.

Stream:JEESubject:ChemistryTopic:GOCSubtopic:Aromaticity

⏱ 2mℹ️ Source: QB

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