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Question

If a hydrocarbon has 5 carbon skeletal and there is a double bond between the 2nd and the 3rd carbon, what is it named as?

A
But-2-ene
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B
Hept-3-ene
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C
Pent-2-ene
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D
Pent-3-ene
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Solution

The correct option is C Pent-2-ene
While naming unsaturated compounds, we consider the number of the least value as the position of the double bond. So the hydrocarbon with 5 carbon skeletal with a double bond positioned at 2 is Pent-2-ene.

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