When $AgNO_3$ comes in contact with skin,it leaves a black stain. This is because of

An alcoholic solution of $KOH$ is a specific reagent for which of the following reactions?

What is the product of the following reaction?
$C_6H_5CH_2Br + KF \xrightarrow{DMF} ?$

Given below are two statements:
Statement $I$: $(Et)_2N-CH_2CH_2Cl$ will undergo alkaline hydrolysis at a faster rate than $(Et)_2CH-CH_2CH_2Cl$.
Statement $II$: Intramolecular substitution takes place first by involving the lone pair of electrons on nitrogen.
In the light of the above statements,choose the most appropriate answer from the options given below:

The correct order of reactivity of the following benzyl halides towards reaction with $KCN$ is:

The transition state of the given $S_N2$ reaction is: