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Nomenclature of Hydrocarbons

A hydrocarbon...

Question

A hydrocarbon with 5 carbons and there is a double bond between the $2^{n d}$ and the $3^{r d}$ carbons, what is it named as?

A

Pentene

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B

Pent-1-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 in a main chain having 5 carbons with double bond position at 2 is Pent-2-ene.

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