Which of the following compounds is obtained when phenol reacts with bromine water?

In Kolbe's reaction,instead of phenol,the phenoxide ion is treated with carbon dioxide. Why?

Which of the following processes does not give benzene as a product?

The reaction of $CH_3CH=CH-C_6H_4-OH$ with $HBr$ gives:

An organic compound $A$ with empirical formula $C_6H_6O$ gives a sooty flame on burning. Its reaction with bromine solution in a low polarity solvent results in a high yield of $B$. $B$ is:

Consider the given chemical reaction sequence:
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Total sum of oxygen atoms in Product $A$ and Product $B$ are .........