The correct IUPAC name of the compound with molecular formula, (CH3)3C – CH3 is.
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I.U.P.A.C Name of this chemical Compound will be-

Select longest chain with selecting functional Group ard substituting Group.
Here No functional Group this is Alkane.
So;-

Common name-Neopentane (Having Neo Group and total 5-carbon)
IUPAC name - 2, 2-Dimethyl propane total 5-carbon.
So option (C) will be correct.