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CGP EDU Academic Team
Published on: August 14, 2026
Explain why 7-bromo-1,3,5-cycloheptatriene exist as an ion while 5-Bromo-1,3-cyclopentadiene does not form any ion even in the presence of Ag + . Explain why ?
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7-bromo-1,3,5-cycloheptatriene on ionisation gives tropylium ion 
which is aromatic & highly stable, but ionisation of 5-bromo-1, 3-cyclopentadiene gives 1, 3-cyclopentadienyl cation 
which is anti aromatic & unstable. (Non existent)
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