Which of the following substituents,when attached at the para-position of aniline,decreases its basicity?

The reaction of $RCONH_2$ with bromine and $KOH$ gives $RNH_2$ as the end product. Which one of the following is the intermediate product formed in this reaction?

The major organic product formed from the following reaction is:

What is obtained when aniline hydrogen sulfate is heated with sulfuric acid at $453 - 473 \, K$?

Which of the following compounds reacts with $HNO_2$ to form an alcohol?

Consider the reaction sequence from $P$ to $Q$ shown below. The overall yield of the major product $Q$ from $P$ is $75 \%$. What is the amount in grams of $Q$ obtained from $9.3 \ mL$ of $P$? (Use density of $P = 1.00 \ g \ mL^{-1}$,Molar mass of $C = 12.0, H = 1.0, O = 16.0$ and $N = 14.0 \ g \ mol^{-1}$)