For $(i) \, I^{-}, \, (ii) \, Cl^{-}, \, (iii) \, Br^{-}$,the increasing order of nucleophilicity would be

The decreasing order of reactivity towards $S_N 1$ reaction for the following compounds is:

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

Which of the following represents the Wurtz-Fittig reaction?

Identify the major product formed when propene is treated with hydrogen chloride followed by Swarts reaction.

Under the specified conditions,substrate $X$ undergoes substitution and elimination reactions to give products $A - D$. $A$ and $B$ are stereoisomers,but not enantiomers. $C$ and $D$ are enantiomers. $A$ is not an isomer of $C$. Which of the following could be the starting material $X$ ?
$X \xrightarrow[\Delta]{H_2O} A + B + C + D$