Tag: ddt

Questions Related to ddt

Carbon tetrachloride is inflammable.
carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. True

  2. False

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Correct Option: B
Explanation:

Carbon tetrachloride $\displaystyle (CCl _4)$ is not inflammable.
Hence, the given statement is false.

Note:
Carbon tetrachloride $\displaystyle (CCl _4)$ is poisionous and water insoluble. It is soluble in ethanol and ether.

What happens when $C{Cl} _{4}$ is treated with $Ag{NO} _{3}$ solution?

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. ${NO} _{2}$ is evolved

  2. A white precipitate of $AgCl$ is formed

  3. $C{Cl} _{4}$ will dissolve in $Ag{NO} _{3}$ solution

  4. No reaction

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Correct Option: D
Explanation:

$C{Cl} _{4}$ is a covalent compound, so it does not react with $Ag{NO} _{3}$

What in formula of Carbon tetrachloride?

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. $CCl _4$

  2. $CCl _3$

  3. $CCl _2$

  4. $CCl$

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Correct Option: A

Which compound is used as a decreasing agent,as spot remover & as five extinguisher?

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. carbon tetrachloride

  2. Methylene chloride

  3. Chloroform

  4. Freons

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Correct Option: C

Fire extinguisher pyrene is:

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. ${CO} _{2}$

  2. $C{Cl} _{4}$

  3. $CH{Cl} _{3}$

  4. ${H} _{2}{CO} _{3}$

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Correct Option: B
Explanation:

Carbon tetra chloride is often known as Fire extinguisher pyrene.

Hence, option B is correct.

State whether the statement is true or false
Carbon tetrachloride burns in the air when lighted to give phosgene.
carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1.  The statement is true

  2.  The statement is false

  3. Neither

  4. Carbon tetrachloride rarely burns in the air when lighted to give phosgene.

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Correct Option: A
Explanation:

Carbon tetrachloride is non-inflammable gas. It does not undergo combustion reaction. Hence, it does not burns in air when ignited to give phosgene. Phosgene is rather formed from chloroform.

The halo compound of methane used as fire extinguisher under the name Pyrene is:

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. $CHCl _{3}$

  2. $CH _{2}Cl _{2}$

  3. $CCl _{2}F _{2}$

  4. $CCl _{4}$

Show answer
Correct Option: D
Explanation:

Carbon tetrachloride $CCl _4$, is widely used in fire extinguishers. The liquid vaporized and extinguished the flames by inhibiting the chemical chain reaction of the combustion process.


In 1910, The Pyrene Manufacturing Company of Delaware filed a patent to use carbon tetrachloride to extinguish fires under the name $Pyrene$.

$CCl _4$ is used as fire extinguisher because:

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. its melting point is high.

  2. It forms covalent bond.

  3. Its boiling point is low.

  4. It gives incombustible vapours.

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Correct Option: D
Explanation:

Its use in the home as a spot remover should be avoided because of its poisonous nature.
Because its vapours (incombustible vapours) are denser than air which leads to a smoother flame.
Hence option D is correct.

Which of the following are polyhalogen compounds?

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. Dichloromethane

  2. Chloroform

  3. Tetrachloromethane

  4. All of the above

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Correct Option: D
Explanation:

Dichloromethane is $CH _2Cl _2$.
Chloroform is $CHCl _3$.
Tetrachloromethane is $CCl _4$. 
All contain more than one halogen, so, they are all polyhalogen compounds.

Which substance is used to extinguish fire in substances like oil, fat and petrol?

carbon tetrachloride ddt preparation of haloalkanes halogen derivatives

  1. $CH _{3}Cl$

  2. $CHCl _{3}$

  3. $CH _{2}Cl _{2}$

  4. $CCl _{4}$

Show answer
Correct Option: D
Explanation:

$CCl _4$ carbon tetrachloride was formerly widely used in fire extinguishers.

option D is correct