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Organic Chemistry

Description: Engineering entrance
Number of Questions: 15
Created by:
Tags: Engineering entrance Alcohols and Phenols Haloalkanes and Haloarenes Class XI / XII Organic Compounds with Functional Groups Containing Oxygen -1 Alkenes and Alkynes
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Urotropine can be obtained by which of the following reactions?

  1. Reaction between formaldehyde and ammonia

  2. Reaction between phenol and formaldehyde

  3. Reaction between vinyl acetylene and hydrochloric acid

  4. Reaction between benzaldehyde and triphenylphosphine alkylindenes

  5. Reaction between acetylene and chlorine

Show answer
Correct Option: A
Explanation:

This option is correct. When formaldehyde and ammonia react with each other, hexamethylene tetramine  is formed. It is called as urotropine.

Which of the following compounds is formed by the action of acetone with bleaching powder?

  1. Ethane

  2. Chloroform

  3. Ethyl alcohol

  4. Nitroethane

  5. Ethenamide

Show answer
Correct Option: B
Explanation:

This option is correct.

What percentage of alcoholic content is present in cider?

  1. 35-50%

  2. 3-6%

  3. 2-6%

  4. 8-10%

  5. Either (3) or (4)

Show answer
Correct Option: C
Explanation:

This option is correct because cider contains 2-6% alcoholic content.

Which of the following are the constituents of green oil?

  1. Anthracene and phenanthrene

  2. Benzene and toluene

  3. Phenol and naphthalene

  4. Cersols and naphthalene

  5. Both (2) and (3)

Show answer
Correct Option: A
Explanation:

This option is correct because green oil shows fluorescence. Both anthracene and phenanthrene are present in green oil.

What are the products formed when 2-methyl but-2-ene is oxidised in the presence of periodic or lead tetra-acetate?

  1. Acetone and acetaldeyde

  2. Acetaldehyde and formaldehyde

  3. Acetic acid and formic acid

  4. Acetone and acetic acid

  5. Benzaldehyde and ethyl acetate

Show answer
Correct Option: A
Explanation:

This option is correct.

When 2 molecules of acetophenone are condensed in the presence of aluminium ter-butoxide, which of the following compounds is formed?

  1. Acetoacetic ester

  2. Dypnone

  3. Pinacol

  4. Phorone

  5. Benzalacetophenone

Show answer
Correct Option: B
Explanation:

This option is correct because  two molecules of acetophenone are condensed in the presence of aluminium ter-butoxide to form   dypnone.

Which of the following mixtures is/are azeotropic?

  1. Power alcohol

  2. Denaturated alcohol

  3. Proof spirit

  4. Rectified spirit

  5. Both (3) and (4)

Show answer
Correct Option: D
Explanation:

This option is correct because rectified spirit contains 95.87% ethyl alcohol and 4.13% water. It cannot be converted into absolute alcohol.  This mixture is an azeotropic mixture.

Elbs persulfate reaction synthesises

  1. benzyl alcohol and soda-benzoate

  2. catechol

  3. catechol and quinol

  4. methylsalicylate

  5. quinol

Show answer
Correct Option: C
Explanation:

This option is correct because  phenol is oxidised in presence of potassium persulphate and alkaline solution to form catechol and quinol.

When two molecules of acetone condense in the presence of dry HCl gas, which of the following compounds is formed?

  1. Mesityl oxide

  2. Phorone

  3. Mesitylene

  4. Schiff's base

  5. Methyl salicylate

Show answer
Correct Option: A
Explanation:

This option is correct as in the presence of dry HCl gas, acetone forms a mixture of mesityl oxide.

Glycerol is oxidised by bismuth nitrate to produce

  1. meso-oxalic acid

  2. resorcinol

  3. phenyl acetate

  4. salicylic acid

  5. salicylaldehyde

Show answer
Correct Option: A
Explanation:

This option is correct.

Which of the following statements is correct about Lucas test?

  1. Tertiary alcohol produces the turbidity immediately.

  2. Alkyl iodide reacts with silver nitrite to form the corresponding nitroalkane.

  3. Primary alcohol gives turbidity within 5 to 10 minutes.

  4. Carbonyl gets reduced into alcohol by using alcoholic sodium.

  5. Iodoform decomposes to free iodine when in contact with organic matter.

Show answer
Correct Option: A
Explanation:

This option is correct because Lucas reagent is a mixture of conc. HCl and anhydrous zinc chloride at room temperature, in which the tertiary alcohols are insoluble. These  produce turbidity immediately.

Phenol reacts with bromine in carbon disulphide at low temperature. Which of the following is/are the major product(s) obtained?

  1. Ortho-bromophenol

  2. 2,4,6 tribromophenol

  3. Para-bromophenol

  4. Both (1) and (2)

  5. Hydroquinone

Show answer
Correct Option: C
Explanation:

This option is  correct because when phenol  reacts with CS2 at low temperature,  para-bromophenol is formed as the major product.

Birnbaurn reaction is given by

  1. benzyl alcohol

  2. ether

  3. ethyl iodide

  4. ester

  5. cyclohexanol

Show answer
Correct Option: D
Explanation:

This option is correct because when silver methanoate is treated with iodine, ester is formed and  carbon dioxide is evolved.

'Oil of wintergreen' is obtained when

  1. salicylic acid is treated in the presence of conc. H2SO4/CH3OH

  2. salicylic acid reacts in the presence of C6H5OH/POCl3

  3. salicylic acid is catalysed by (CH3CO)2CO

  4. Both (2) and (3)

  5. phenol is condensed with benzene diazonium chloride

Show answer
Correct Option: A
Explanation:

This option is correct because salicylic acid is treated in the presence of sulphuric acid and methyl alcohol to form methylsalicylates. It is called as oil of wintergreen.

Mesitylene is formed when

  1. 2 molecules of acetylene react with sulphur

  2. 3 molecules of acetylene are catalysed by red hot tube

  3. 4 molecules of acetylene are catalysed by nickel cyanide under pressure

  4. 3 molecules of propyne are passed through red hot tube

  5. 2 molecules of acetophenone are catalysed in the presence of aluminium tetraoxide

Show answer
Correct Option: D
Explanation:

This option is correct because three molecules of propyne, when passed through the red hot tube, cyclic polymerisation  takes place,  and forms 1,3,5 trimethylbenzene. It is also known as mesitylene.

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