The IUPAC name of the above shown compound is:

2-Ethyl-3-methylbut-1-ene

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2-isopropylbut-1-ene

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3-ethyl-2-methylbut-3-ene

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ethylisopropylethane

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Solution

The correct option is D 2-Ethyl-3-methylbut-1-ene
The parent hydrocarbon contains 4 carbon atoms and a double bond at $1^{s t}$ position.
One methyl group is present on the $3^{r d}$ carbon atom and one ethyl group is present on the $2^{n d}$ carbon atom.

Therefore, the IUPAC name of the compound is 2-ethyl-3-methylbut-1-ene.

Hence, option $A$ is correct.

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Structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is:

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