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Identify compounds (A) and (B)...

Identify compounds `(A)` and `(B)`

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Acetoacetic acid
`(3-` oxo `-` butanoic acid `)` is bi`-`functional and kept in the centre with the other two groups on either side. It is unsymmetrical, so two isomers of `(A)` would be obtained.
First way of combination `:`


Second way of combination `:`

Two isomers of `(A)` are possible.
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