Tag: carbon tetrachloride

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Multiple choice carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

The fire extinguisher 'Pyrene' contains:

  1. carbon dioxide

  2. carbon disulphide

  3. carbon tetrachloride

  4. chloroform
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

Multiple choice carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

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 ]  

  1. 157 Ib

  2. 71.3 Ib

  3. 84 kg

  4. 15 Ib
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The molar mass of chloral (CCl3CHO) is ~147.5 g/mol and chlorobenzene (C6H5Cl) is ~112.5 g/mol. DDT (C14H9Cl5) is ~354.5 g/mol. Based on stoichiometry, 100lb of chloral reacts with 100lb of chlorobenzene. Chloral is the limiting reagent. Calculation yields approximately 157 lb of DDT.

Multiple choice carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

DDT concentration in the human body is?

  1. 0.3-0.7 ppm

  2. 1.3-3.1 ppm

  3. 13-31 ppm

  4. 30-70 ppm.
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

Drawback of DDT as pesticides is that?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$The\quad correct\quad answer\quad is\quad option(c).$

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

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

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