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The hybridization of the carbon atoms in 2-methylprop-1-ene (isobutylene) is as follows:
The carbon atom in the double bond (C1) is sp2 hybridized. It forms three sigma bonds (one with the other carbon in the double bond and two with hydrogens) and one pi bond (with the other carbon in the double bond).
The carbon atom attached to the methyl group (C2) is sp3 hybridized. It forms four sigma bonds (one with the carbon in the double bond, one with the methyl group, and two with hydrogens).
The carbon atom in the methyl group (C3) is sp3 hybridized. It forms four sigma bonds (three with hydrogens and one with C2).