Tag: haloalkanes and haloarenes

Questions Related to haloalkanes and haloarenes

Which of the following is used for metal cleaning and finishing?

polyhalogen compounds haloalkanes and haloarenes chemistry

  1. $CHCl _{3}$

  2. $CHI _{3}$

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

  4. $C _{6}H _{6}$

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Correct Option: C
Explanation:

Chloroform is used as solvent and as anaesthetic.
$CHI _3$ is used as antiseptic.
$CH _2Cl _2$ is used for metal cleaning and finishing.
$C _6H _6$ is used for printing and lithography, paint, rubber, dry cleaning, adhesives and coatings, detergents.

Consider the following reaction $C _2H _5I \xrightarrow[x]{\triangle} $ (Pleasant smelling liquid) X is?

polyhalogen compounds haloalkanes and haloarenes chemistry

  1. Sodium

  2. Dry silver oxide

  3. Ethyl chloride

  4. Dry silver powder

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Correct Option: B
Explanation:

Since, the product is a pleasent smelling liquid, it must be an ether. $C _2H _5I$ forms diethyl ether on reaction with dry silver oxide.

Hence $X$ is an dry silver oxide.

What is not a polyhalogen?

polyhalogen compounds haloalkanes and haloarenes chemistry

  1. Methyl chloride

  2. Dichloro methane

  3. Chloroform

  4. Carbon tetrachloride

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Correct Option: A

Which of the following compounds will give haloform test?
(i) $CH _3COCH _2l$
(ii) $CH _3CHCl-CH _3$
(iii) $C _6H _5COCH _3$
(iv) $CH _3CH _2Br$
The correct answer is

polyhalogen compounds haloalkanes and haloarenes chemistry

  1. $I,II$

  2. $III,IV$

  3. $II,III$

  4. $I,II,III,IV$

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Correct Option: D

Bayer's reagent is

polyhalogen compounds haloalkanes and haloarenes chemistry

  1. $Br _{2}/CCl _{4}$

  2. Cold, dilute alkaline $KMnO _{4}$

  3. Acidified $KMnO _{4}$

  4. $O _{3}/Zn/H _{2}O$

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Correct Option: B

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

polyhalogen compounds haloalkanes and haloarenes chemistry

  1. I> II> III> IV

  2. IV> III> II> I

  3. IV> I> II> III

  4. IV> I> III> II

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Correct Option: C

Which of the following is used in paint removing ?

polyhalogen compounds haloalkanes and haloarenes chemistry

  1. $CHCl _{3}$

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

  3. $CCl _{4}$

  4. $CH _{3}Cl$

Show answer
Correct Option: B
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.

Carbon tetrachloride is inflammable. 

polyhalogen compounds haloalkanes and haloarenes chemistry

  1. True

  2. False

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Correct Option: B

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

polyhalogen compounds haloalkanes and haloarenes chemistry

  1. a solution of salt in water

  2. tetrachloroethylene

  3. water

  4. alcohol

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Correct Option: B
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'.

Dehydrohalogenation of alkyl halides is a common preparation method of:

polyhalogen compounds haloalkanes and haloarenes chemistry

  1. alkenes

  2. alkanes

  3. haloalkenes

  4. both A and B

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Correct Option: A
Explanation:

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