A hydrocarbon has molecular formula C4H6. Which of the class of hydrocarbons cannot have this formula?
A
A cycloalkene
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B
A bicycloalkane
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C
A diene
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D
A bicycloalkene
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Solution
The correct option is D A bicycloalkene C4H6 has two degree of unsaturation (two H2 less than saturated hydrocarbons), therefore it can be a diene, a cycloalkene or a bicycloalkane but it cannot be a bicycloalkene because it has three degrees of unsaturation.