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A + CH$_3$MgBr $\to$ B $\xrightarrow{\text{Cu, 573K}}$ 2-methyl-2-butene. Mass percentage of carbon in A is ____.
B dehydrates to 2-methyl-2-butene, so B = 2-methylbutan-2-ol. A + CH$_3$MgBr = B, so A = butanone (CH$_3$COCH$_2$CH$_3$, C$_4$H$_8$O, MW = 72). Mass % C = $(48/72) \times 100 = 66.67%$.
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