The major product obtained in the above reaction is

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A):$ $R-I$ undergoes $S_N2$ reaction faster than $R-Cl$.
Reason $(R):$ Iodine is a better leaving group because of its large size.
In the light of the above statements,choose the correct answer from the options given below:

Select the incorrect order among the following:

The order of reactivities of methyl halides in the formation of Grignard reagent is

Chloroform is stored in dark-colored bottles because it ..............

Observe the following reactions. The order of reactivity of $x, y, z$ towards $S_{N}1$ reaction is: