How do kidnappers use chloroform in movies?

In the following sequence of reactions, the gaseous species $\mathrm{A}\text{,} \mathrm{B}\text{,} \mathrm{D}\text{,} \mathrm{E}$, respectively, are

Which substance is added in chloroform before the use of it as anaesthetic?

How many $\mathrm{\sigma }$ and $\mathrm{\pi }$ bonds are present in the structure of D.D.T respectively?

Predict the product:

${\mathrm{CHCl}}_3+{\mathrm{O}}_2\stackrel{\mathrm{sunlight}}{\to }$