Tag: polyhalogen compounds

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Questions Related to polyhalogen compounds

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Acidity of fluoroform (I), bromoform (II), iodoform (III) and chloroform (IV) in decreasing order is as follows:

  1. I> II> III> IV

  2. IV> III> II> I

  3. IV> I> II> III

  4. IV> I> III> II
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The acidity of haloforms depends on the stability of the conjugate base (carbanion). The stability follows the order of electronegativity of the halogen: F > Cl > Br > I. Thus, the acidity order is fluoroform > chloroform > bromoform > iodoform (IV > I > II > III).

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Which of the following is used in paint removing ?

  1. $CHCl _{3}$
  2. $CH _{2}Cl _{2}$
  3. $CCl _{4}$
  4. $CH _{3}Cl$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$CHCl _3$ is used as solvent and as an anaesthetic.

$CCl _4$ is used as a fire extinguisher.
$CH _2Cl _2$ is used as paint removing.
$CH _3Cl$ is used as a refrigerant.

Hence, the correct option is B.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Carbon tetrachloride is inflammable. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon tetrachloride (CCl4) is non-flammable and has historically been used as a fire extinguishing agent. Therefore, the statement that it is inflammable is false.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Chocolates and fatty foods containing butter or oil sometimes leave stains on clothes that are difficult to remove. They can be removed by:

  1. a solution of salt in water

  2. tetrachloroethylene

  3. water

  4. alcohol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chocolates and food strains can be removed by tetrachloroethylene. It is a colourless liquid widely used for cleaning of fabrics and therefore called 'Dry-Cleaning fluid'.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Dehydrohalogenation of alkyl halides is a common preparation method of:

  1. alkenes

  2. alkanes

  3. haloalkenes

  4. both A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dehydrohalogenation is an organic reaction in which alkyl halide when boiled with alcoholic alkali gives corresponding alkene. It is known as elimination reaction.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Alkaline hydrolysis of 1,1,1-trichloro derivative (A) of an alkane gives a molecule (B) which produces red coloration with aqueous ${ FeCl } _{ 3 }$. The compound (A) is ?

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

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Alkaline hydrolysis of a trichloro derivative will give a carboxylic acid. The carboxylic acid that gives red colouration with aqueous $FeCl _{3}$ is acetic acid $CH _{3}COOH$. Hence, the compound  A is $CH _{3}CCl _{3}$.