What is iodoform used for?

How the following conversion can be carried out:

D.D.T. from Chlorobenzene

How will you convert the following ?

• Chlorobenzene to D.D.T

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

Write structural formula of $\text{'}\mathrm{A}\text{'}$ for the following reaction:

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl}+{\mathrm{Cl}}_3\mathrm{C}-\mathrm{CHO}\stackrel{\mathrm{conc}.{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }\mathrm{A}$

Give one use of Feron.

Note: The question given in the book seems to have error and the modified question should be as given below:

Give one use of Freon.

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