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Question

The total number of cyclic isomers for the hydrocarbon having the formula C4H6 is ___

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Solution

First calculate the degree of unsaturation / DBE:

DBE=C+1H2+N2=4+13=2

Plus we want only the cyclic hydrocarbons, so there should be at least one ring:

The required isomers can have two rings or a ring + double bond. Let us list down the structures:

There are five structures.


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