Consider the following reactions
The mass percentage of carbon in A is ______.
The mass percentage of carbon in A is ______.
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Correct Answer: 66.67
Solution and Explanation
Cu at 573 K dehydrates a tertiary alcohol to an alkene. 2-Methyl-2-butene, \(\mathrm{(CH_3)_2C=CHCH_3}\), comes from B = 2-methylbutan-2-ol, \(\mathrm{(CH_3)_2C(OH)CH_2CH_3}\).
A Grignard reagent adds to a ketone and, after hydrolysis, gives a tertiary alcohol. The new CH3 group is delivered to the carbonyl carbon, so A = \(\mathrm{CH_3COCH_2CH_3}\) (butan-2-one), \(\mathrm{C_4H_8O}\).
Molar mass of A = \(4(12)+8(1)+16 = 72\) g/mol.
Mass % of C = \(\frac{48}{72}\times 100 = 66.67\%\).
Answer: 66.67
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