The IUPAC name for the compound CH3-C(CH3)2-CH2-CH3 is:
2,2-Dimethylbutane
Write out the skeleton: CH3-C(CH3)2-CH2-CH3. The longest continuous carbon chain runs CH3 → C → CH2 → CH3, i.e. four carbons, so the parent hydrocarbon is butane.
Two methyl branches hang from the second carbon of that chain. Numbering from the end that gives the branches the lowest locants puts both of them at position 2, so the substituent prefix is 2,2-dimethyl. Numbering from the other end would make them 3,3-dimethyl, which is the higher set of locants and is therefore not used.
Hence, the answer is 2,2-Dimethylbutane.
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