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# The IUPAC name of the compound

$(a)\;1,1-dimenthyl-2-propene \\ (b)\;3- methyl -1-butene \\ (c)\;2-vinyl propane \\ (d)\;1- isopropyl \;ethylene$

It is correct IUPAC name is $3- methyl -1-butene$
Hence b is the correct answer.