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$L-$isomer of a compound $'A'$ $\left( C _{4} H _{8} O _{4}\right)$ gives a positive test with $\left[ Ag \left( NH _{3}\right)_{2}\right]^{+}$. Treatment of $'A'$ with acetic anhydride yield triacetate derivative. Compound $'A'$ produces an optically active compound $(B)$ and an optically inactive compound $(C)$ on treatment with bromine water and $HNO _{3}$ respectively, compound $( A )$ is ....