In which of the following reactions hydrogen gas is not liberated?

I, II

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II, III

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I only

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III only

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Solution

The correct option is D I only
I. Cyclopropene does not react with Potassium metal to give hydrogen gas . It contains 4pi anti aromatic character.
II. Cyclopentadiene reacts with K metal to give hydrogen gas and it has 6pi electrons(4n+2).
III. Cyclooctatetraene dianion contains 10 electrons in pi system and the dianion is easily formed as the molecule is aromatic.

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I I - I I I I + I I I + I I I I I =

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