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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm063

The molecular formula of ethanoic 2-methylpropanoic anhydride is:

A $C X_{6} H X_{10} O X_{2}$
B $C X_{6} H X_{10} O X_{3}$
C $C X_{6} H X_{12} O X_{3}$
D $C X_{5} H X_{8} O X_{3}$

Answer: B

The compound is

CH X_{3} CO - O - CO - CH (CH X_{3}) X_{2}

. Carbon: 2 (acetyl) + 4 (isobutyryl) = 6. Hydrogen: 3 + 7 = 10. Oxygen: 3 (two C=O and one bridging O). The formula is

C X_{6} H X_{10} O X_{3}

.

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