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(B) $1$. The compound $'X'$ is acidic and soluble in $NaOH$ but insoluble in $NaHCO_3$. This indicates that the compound is more acidic than water but

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Phenol

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(B) $1$. The compound $'X'$ is acidic and soluble in $NaOH$ but insoluble in $NaHCO_3$. This indicates that the compound is more acidic than water but less acidic than carbonic acid $(H_2CO_3)$. Phenols typically satisfy this condition.$2$. The compound gives a violet colour with neutral $FeCl_3$ solution. This is a characteristic test for the presence of a phenolic group ($-OH$ group attached directly to a benzene ring).$3$. Among the given options,Phenol $(C_6H_5OH)$ is the only compound that contains a phenolic group and satisfies all the given chemical properties.$4$. The reaction with $FeCl_3$ is: $6C_6H_5OH + FeCl_3 \rightarrow [Fe(C_6H_5O)_6]^{3-} + 6H^+ + 3HCl$ (forming a violet complex).

$A$ compound $'X'$ is acidic and it is soluble in $NaOH$ solution,but insoluble in $NaHCO_3$ solution. Compound $'X'$ also gives a violet colour with neutral $FeCl_3$ solution. The compound $'X'$ is:

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