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Organic Reactions

Description: engineering entrance
Number of Questions: 15
Created by:
Tags: Engineering entrance Haloalkanes and Haloarenes Group 15 Elements Alcohols and Phenols Dyes Classification of Drugs Amines
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Which of the following categories of phosphorus can be ignited at low temperature?

  1. Violet phosphorus

  2. Red phosphorus

  3. White phosphorus

  4. Yellow phosphorus

  5. Black phosphorus

Show answer
Correct Option: D
Explanation:

This option is correct because the spontaneous combustion of yellow phosphorus takes place at room temperature.

Antimony trioxide is used for

  1. flame-retardation

  2. Anti-schistosomal

  3. Skin-conditioner in rumenants

  4. Anthelmintic

  5. Infra red detectors

Show answer
Correct Option: A
Explanation:

This option is correct because the antimony trioxide is the main application for flame-retardation synergist in combination with halogenated materials. 

Which of the following is also known as Crystal violet?

  1. Gentian violet dyes

  2. Leuco dyes

  3. Magneta dyes

  4. Quinoline dyes

  5. Mordant antheraquinoids dyes

Show answer
Correct Option: A
Explanation:

This option is correct. Crystal violet is also known as Gentian violet dyes or Pyoctanin dyes.These dyes are used in histological stain and Gram's methods of the classifying bacteria.

Phenol is oxidised in the presence of potassium persulphate to give

  1. hydroquinone

  2. Quinol and catechol

  3. Ortho-hydroxyacetophenone and para-hydroxyacetophenone

  4. Anisole

  5. Ethyl chloride and ethyl acetate

Show answer
Correct Option: B
Explanation:

This option is correct. Phenol when oxidised in presence of potassium persulphate, it gives quinol and catechol.

Alizarin belongs to the class of

  1. magneta dyes

  2. Leuco dyes

  3. Mordant anthraquinoides dyes

  4. Acidic athraquinoides dyes

  5. Both 1 and 2

Show answer
Correct Option: C
Explanation:

This option is correct. Alizarin belongs to the class of mordant anthraquinone dyes.This is present in the roots of the maddar plant. It is synthesised from phthalic anhydride. 

When Benzyl chloride is oxidised in presence of lead nitrate, which of the following compounds is formed?

  1. Benzaldehyde

  2. Benzoic acid

  3. Benzotrichloride

  4. Ortho-chlorobenzoic acid

  5. Toluene

Show answer
Correct Option: A
Explanation:

This is correct. Benzaldehyde is formed when benzyl chloride is oxidised in the presence of lead nitrate.

Which of the following is known as Aqua fortis?

  1. Sulphuric acid

  2. Nitric acid

  3. Potassium nitrate

  4. Sodium nitrate

  5. Barium hydroxide

Show answer
Correct Option: B
Explanation:

This option is correct. Nitrogen pentaoxide and nitrogen oxide  react with water to form small amount of nitric acid also called as aqua fortis.

When aniline is oxidised in presence of MnO2/H2SO4, which of the following compounds is formed?

  1. Para-benzaquinone

  2. Otho-phenolsulphonic acid

  3. Ortho-nitrophenol

  4. Ortho-benzaquinone

  5. Options 3 and 4

Show answer
Correct Option: A
Explanation:

This option is correct because when aniline is treated in the presence of MnO2 and H2SO4, para-benzoquinone is formed.

The two OH groups are present in which of the following compound?

  1. Picric acid

  2. Styphinic acid

  3. Aspirin

  4. Oil of winter green

  5. Options 3 and 4

Show answer
Correct Option: B
Explanation:

This option is correct because when the resorcinol are nitrated to give the 2,4,6 trinitroresorcinol, it is called as the styphinic acid that contains two OH group.

When 2-methyl,2-butanol is oxidised in presence of acidic potassium permagnate, which of the following pair of compounds is formed?

  1. CH3COOH, CH3COOH

  2. CH3COOH, HCOOH

  3. HCOOH, CH3COCH3

  4. CH3COCH3, HCOOH

  5. Both 1 and 2

Show answer
Correct Option: D
Explanation:

This option is correct because when 2-methyl,2-butanol is oxidised in the presence of acidic potassium permanganate, acetone and formic acid are formed.

Which of the following methods is used to get nitrosobenzene?

  1. Aniline is oxidised in presence of hydrogen peroxide.

  2. Aniline is oxidised in presence of the potassium permagnate and sulphuric acid.

  3. Aniline is oxidised in presence of potassium dichromate and sulphuric acid.

  4. Para-nitroacetanilide is hydrolysed.

  5. Options 2 and 3

Show answer
Correct Option: A
Explanation:

This option is correct because when aniline is oxidised in the presence of hydrogen peroxide, we get nitrosobezene.

When para-nitrosodimethyl aniline is boiled with alkali, it gives

  1. cyclohexamine

  2. acetanilide

  3. meta-nitroaniline

  4. para-nitrophenol

  5. None of these

Show answer
Correct Option: D
Explanation:

This option is correct. When para-nitrosodimethyl aniline is boiled with sodium hydroxide, it gives para-nitrophenol.

Which of the following contains zinc compound?

  1. Mum

  2. Foundation

  3. Pearlesences

  4. Red lipstick

  5. Option 3 and 4

Show answer
Correct Option: A
Explanation:

This option is correct. Mum, the first commercial deodorant does contain the zinc compound. It is active ingredient human perspiration, which is largely odourless, until it is fermented by bacteria.

Which of the following statement is correct about lyophilic sols?

  1. Surface tension is of the same order as that of the dispersion medium.

  2. Viscosity range is about the same as that of the dispersion medium.

  3. Addition of the small quantity of the electrolytes causes precipitation.

  4. A much large quantity of electrolytes are required to cause precipitation.

  5. The particles migrate either to cathode or to anode under the influence of an electric field.

Show answer
Correct Option: D
Explanation:

This option is correct.

Which of the following compounds is also known as 'Paris green?'

  1. Cu(C2H3O2)2.3Cu(AsO2)2

  2. As2S3

  3. As4S4

  4. As2O3

  5. CuHAsO3

Show answer
Correct Option: A
Explanation:

This option is correct because when the copper acetate and arsenic oxide react, copper(II) acetatoarsenite is formed. It is used as agricultural insecticides and is known as Paris green.

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