Tag: halogen derivatives

Questions Related to halogen derivatives

The fire extinguisher 'Pyrene' contains:

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. carbon dioxide

  2. carbon disulphide

  3. carbon tetrachloride

  4. chloroform

Show answer
Correct Option: C
Explanation:

Carbon tertrachloride is commonly used liquid in fire extinguishers to control fire. When heated to decomposition, it emits fumes of toxic phosgene and of hydrogen chloride. 

The insecticide DDT is made by the reaction 
${\text{CC}}{{\text{l}} _{\text{3}}}{\text{CHO}}\left( {{\text{chloral}}} \right){\text{ + 2}}{{\text{C}} _{\text{6}}}{{\text{H}} _{\text{5}}}{\text{Cl}}\left( {{\text{chlorobenzene}}} \right) \to {\left( {{\text{Cl}}{{\text{C}} _{\text{6}}}{{\text{H}} _{\text{4}}}} \right) _{\text{2}}}{\text{CHCC}}{{\text{l}} _{\text{3}}}\left( {{\text{DDT}}} \right){\text{ + }}{{\text{H}} _{\text{2}}}{\text{O}}$
If 100 pound (Ib) of chloral were treated with 100 Ib  of chlorobenzene, how much DDT would be from 
(Assume the reaction goes to completion without side reactions side reactions or losses) [ 1 Ib = 453.6 ]  

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. 157 Ib

  2. 71.3 Ib

  3. 84 kg

  4. 15 Ib

Show answer
Correct Option: A

DDT concentration in the human body is?

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. 0.3-0.7 ppm

  2. 1.3-3.1 ppm

  3. 13-31 ppm

  4. 30-70 ppm.

Show answer
Correct Option: C
Explanation:
Dichlorodiphenyltrichloroethane, commonly known as DDT, is a colorless and almost odorless crystalline chemical compound, an organochlorine, originally developed as an insecticide. Now the human body resides about high levels of DDT which is highly toxic to their health.
So the correct option is '13-31ppm'.

What is DDT among the following?

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. Green House Effect

  2. A fertiliser

  3. Biodegradable pollutant

  4. Non-biodegradable pollutant

Show answer
Correct Option: D
Explanation:

DDT is a non-biodegradable pollutant. It cannot be broken down into simple and harmless substance.

Drawback of DDT as pesticides is that?

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. it is less effective than others

  2. it becomes ineffective after some time

  3. it is a non-degradable substance

  4. it is very costly

Show answer
Correct Option: C
Explanation:
$The\quad correct\quad answer\quad is\quad option(c).$

 $DDT(dichlorodiphenyltrichloroethane)\quad is\quad a\quad colourless,crystalline,tasteless\quad and\quad almost\quad odourless\quad organo\quad chlorine\quad used\quad as\quad pesticide$.

$A\quad pollutant\quad that\quad is\quad not\quad broken\quad down\quad by\quad natural\quad processes\quad is\quad known\quad as\quad non-degradable\quad substance.$

$Hence\quad DDT\quad is\quad a\quad non-degradable\quad substance.$