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Organic Chemistry

Description: Engineering entrance
Number of Questions: 15
Created by:
Tags: Engineering entrance Amines Dyes Classification of Drugs Some Important Polymers Polymers of Commercial Importance Derivatives of Carboxylic Acids Preparation of Carboxylic Acids Alcohols and Phenols
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Pimelic acid is treated with acetic anhydride at 300oC to give

  1. cyclohexanone

  2. cyclopentanone

  3. glutaric anhydride

  4. succenic anhydride

  5. formic acid

Show answer
Correct Option: A
Explanation:

This option is correct because when 1,7 heptanedioic acid(pimelic acid) is treated with acetic anhydride at 300oC, it gives cyclohexanone.

Which of the following compounds belongs to Leuco dyes?

  1. Crystal violet lactone

  2. Magenta dyes

  3. Methylene blue

  4. Methyl blue

  5. Egyptean blue

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Correct Option: A
Explanation:

This option is correct because the crystal violet lactone is called leuco dyes, a lactone is the derivatives of crystal violet 10B in pure state, it is slightly yellowish crystalline solid powder. It is non polar or slightly polar organic solvent.

Cumene hydroperoxide are decomposed by sulphuric acid to give

  1. anisole

  2. phenyl acetate

  3. benzalaniline

  4. cumene

  5. phenol

Show answer
Correct Option: E
Explanation:

This option is correct because cumene hydroperoxides is decomposed with sulphuric acid to form phenol.

Koroseal is also known as

  1. vinyl chloride

  2. acrylonitrile

  3. vinylidine chloride

  4. tetrafluoroethylene

  5. None of these

Show answer
Correct Option: A
Explanation:

This option is correct because polyvinylchloride polymer compounds is called the koroseal.

Quinoline dyes belong to

  1. cyanines

  2. proflavine

  3. fluorescein

  4. uranine

  5. para red

Show answer
Correct Option: A
Explanation:

This option is correct because the quinoline dyes are also called cyanine. It  consists of  two nitrogen hetrocyclic nuclei joined together through the odd number conjugated carbon present in the mono acidic salt form.

1, 4 benzaquinone is prepared by the oxidation of the di isopropylbenzene. Which of the following rearrangement shows the reaction?

  1. Hock rearrangement

  2. Theile reaction

  3. Wohl-Aue reaction

  4. Elbs reaction

  5. Options (3) and (4)

Show answer
Correct Option: A
Explanation:

This option is correct because oxidation of di isopropylbenzene forms the 1,4 benzaquinone is related to the hock rearrangement.

The oxidation of aniline in the presence of hydrogen peroxide gives

  1. oil of mirbane

  2. cabowax

  3. natalite

  4. argan oil

  5. oil of amber

Show answer
Correct Option: A
Explanation:

This option is correct.

When Acetylene is added to arsenic chloride in the presence of AlCl3 and Cu2Cl2, which of the following products is formed?

  1. Lewisite

  2. Westron

  3. Acetaldehydes

  4. Glyoxal

  5. Oxalic acid

Show answer
Correct Option: A
Explanation:

This option is correct because when acetylene is added to arsenic chloride in the presence of AlCl3 and Cu2Cl2, it forms a poisnous compound called lewisite.

When benzaldeyhydes are refluxed in the presence of alcoholic KCN, it gives

  1. benzoin

  2. cinnamic acid

  3. cinnamaldehydes

  4. hydrobenzoin

  5. Both 2 and 3

Show answer
Correct Option: A
Explanation:

This option is correct.

Which of the following compounds play an important role in the manufacture of photographic rubber?

  1. Aniline

  2. Toluylene red

  3. Chloranile

  4. Hydroquinone

  5. Both the options (1) and (2)

Show answer
Correct Option: D
Explanation:

This option is correct because quinone is mainly used as the precursors of hydroquinone. It is used in photography rubber manufacture.

The condensation of hexamethylenediamine and 1, 10 decandioic acid gives

  1. nylon 6, 6

  2. nylon 6, 10

  3. urethane

  4. nylon 6

  5. prepolymer

Show answer
Correct Option: B
Explanation:

This option is correct.

Caffeic acid is found in

  1. potatoes

  2. peanuts

  3. eucalyptus bark

  4. Apple

  5. Both 1 and 2 correct

Show answer
Correct Option: C
Explanation:

This option is correct because in eucalyptus globulus bark or fresh water fern Salvenia molista or mushroom Phellinus lintus caffeic acid is found.

Novolak resin is formed

  1. by the condensation of hexamethylenediamine and 1, 10 decandioic acid

  2. when isocyanate reacts with alcohol

  3. by heating excess of phenol with formaldehydes (P/F ratio nearly 1.25) in the presence of acid catalyst

  4. by the interaction of phenol with excess formaldehydes (P/F ratio nearly 0.8)

  5. when urea is heated at 300oC and 100 atmospheric pressure

Show answer
Correct Option: C
Explanation:

This option is correct because when excess of phenol is heated with formaldehydes (P/F ratio nearly 1.25) in the presence of the acid catalyst, novolak resin is formed.

Carbowax is prepared by which of the following methods?

  1. When para-nitroso N-N dimethylaniline is decomposed by caustic soda.

  2. When dimethylene amine hydrochloride reacts with NaOH.

  3. When thermal decomposition of hexamethyl ammonium hydroxide takes place.

  4. When dimethyl amine reacts with nitrous acid.

  5. When the ethylene oxide is polymerised.

Show answer
Correct Option: E
Explanation:

This option is correct because when ethylene oxide are polymerised it gives polyethyleneglycol, which is known as carbowax.

Which of the following statements is/are incorrect about phloretin?

  1. Phloretin is obtained from apple leaves.

  2. Phloretin inhibits the transportation of glucose into the cell by SGLT1 and SGLT2.

  3. Phloretin inhibits glucose transportation in large intestine.

  4. Phloretin inhibits urea transport.

  5. Both 1 and 2

Show answer
Correct Option: C
Explanation:

This option is correct.

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