What product is obtained during the hydrogenation of phenol in the presence of a nickel catalyst at $160\,^oC$?

The product $(B)$ will be:

Which of the following substituents will decrease the acidic strength of phenol?

The major product of the reaction is $CH_3-CH=CH-C_6H_4-OH + HBr \rightarrow ?$

Which of the following compounds is least likely to give effervescence of $CO_2$ in the presence of aqueous $NaHCO_3$?

The nitration of phenol with dilute $HNO_3$ at low temperature yields a mixture of two isomers $(A)$ and $(B)$. Product $(A)$ is more volatile than product $(B)$. Identify $(A)$.