Final answer:
The IUPAC name for H₂C = CHC(CH₃)₃ is 2-methyl-2-butene, which is named based on the longest carbon chain containing the double bond and the position of the methyl substituent.
Step-by-step explanation:
The IUPAC name for the compound with the molecular formula H₂C = CHC(CH₃)₃ is 2-methyl-2-butene. This compound is an alkene, which means it contains at least one carbon-carbon double bond. In IUPAC nomenclature, we number the longest carbon chain that includes the double bond to give the lowest possible numbers to the double bond and any substituents.
To name this compound, we first identify the longest chain of carbon atoms containing the double bond, which is a four-carbon chain. This makes the base name of the compound 'butene'. The double bond starts at the second carbon atom, indicating its position. There is also a methyl group (CH₃) attached to the second carbon atom. To denote the position of the substituent, we precede the base name with a number indicating the carbon to which the substituent is attached, resulting in '2-methyl'. Combining these elements gives us the IUPAC name, 2-methyl-2-butene.