Which of the following is the correct decreasing order of the boiling point of the given compounds?

The treatment of alkyl chlorides with aqueous $KOH$ leads to the formation of alcohols,but in the presence of alcoholic $KOH$,alkenes are the major products. Explain.

The correct order of $C-X$ bond polarity is:

Which one of the following compounds is most reactive towards $S_N1$ reaction?

Which of the following is added to chloroform to slow down its aerial oxidation in the presence of light?

Bottles containing $C_6H_5I$ and $C_6H_5CH_2I$ lost their original labels. They were labelled $A$ and $B$ for testing. $A$ and $B$ were separately taken in test tubes and boiled with $NaOH$ solution. The end solution in each tube was made acidic with dilute $HNO_3$ and then some $AgNO_3$ solution was added. Substance $B$ gave a yellow precipitate. Which one of the following statements is true for this experiment?