The IUPAC name of the compound CH$_3$CH(CH$_3$)CH$_2$CH$_3$ is
Apentane
B2-ethylpropane
C2-methylbutaneCORRECT
D3-methylbutane
JUPEBChemistryOrganic Chemistry: Hydrocarbons
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Why the answer is C, and why the others tempt you.
The longest continuous chain has four carbons (butane) and a methyl branch on carbon 2 when numbered from the end nearest the branch. Numbering from the other end wrongly gives 3-methylbutane, and the longest chain must be chosen, so 2-ethylpropane is incorrect.
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