How many cyclic isomers are possible for C_4H | vedclass

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(C) The molecular formula $C_4H_6$ corresponds to a degree of unsaturation (double bond equivalent) of $4 - (6/2) + 1 = 2$. For cyclic isomers,we look

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$5$

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(C) The molecular formula $C_4H_6$ corresponds to a degree of unsaturation (double bond equivalent) of $4 - (6/2) + 1 = 2$. For cyclic isomers,we look for structures with rings and double bonds or multiple rings. The possible cyclic isomers are: $1$. Methylcyclopropene (two isomers based on double bond position). $2$. Methylenecyclopropane. $3$. Cyclobutene. $4$. Bicyclobutane. Thus,there are $5$ possible cyclic isomers.

How many cyclic isomers are possible for $C_4H_6$?

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Identify the pairs of compounds that represent chain isomerism among the following:
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