The hydrolysis of optically active $2-$bromobutane with aqueous $NaOH$ results in the formation of:

Which one of the following compounds will be least susceptible to the elimination of hydrogen bromide $(HBr)$?

$1$-methyl ethylene oxide (propylene oxide) when treated with an excess of $HBr$ produces:

Identify the product of the following reaction:
(See image for reaction scheme)
Product; The product is:

Two bottles containing $C_6H_5I$ and $C_6H_5CH_2I$ have lost their original labels. They are labeled as $A$ and $B$ for testing. $A$ and $B$ are taken separately in test tubes and boiled with $NaOH$ solution. The final solution of each test tube is acidified with dilute $HNO_3$ and a little $AgNO_3$ is added. Solution $B$ gives a yellow precipitate. Which of the following statements is correct?

Arrange the following three chlorides in decreasing order of their reactivity towards $S_{N^1}$ reaction.