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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm085

Select the correct statements about anhydrides and acyl halides.

A $CH X_{3} COBr$ is ethanoyl bromide.
B $CH X_{3} COOCH (CH X_{3}) X_{2}$ is propyl ethanoate.
C $(CH X_{3} CH X_{2} CO) X_{2} O$ is propanoic anhydride.
D $CH X_{3} CO - O - CHO$ is named methanoic ethanoic anhydride.

Answer: A, C

The symmetrical anhydride of propanoic acid is propanoic anhydride (true).

CH X_{3} COBr

is ethanoyl bromide (true). The mixed anhydride cites the acids alphabetically, so it is ethanoic methanoic anhydride, not methanoic ethanoic (false).

CH X_{3} COOCH (CH X_{3}) X_{2}

is propan-2-yl ethanoate, since the group on oxygen is attached by its middle carbon (false).

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