Organic Chemistry – Some Basic Principles and Techniques

(I) and (II) are :

• enantiomers

• diastereomers

• meso compound

• identical

Assertion :Tertiarycarbonium ions are generally formed  more easily than primary carbonium ions.

Reason : Hyperconjugation as well as inductive effect due to additional alkyl groups stabilize tertiary carbonium ions.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Pyrrole is an aromatic heterocyclic compound.

Reason : It has cyclic delocalised 6$\mathrm{\pi }$ electrons.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : trans-butene on reaction with bromine forms racemic mixture.

Reason : trans-compound in trans addition forms two types of stereoisomers.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

K₂HgI₄ is used to test the following :

• NH₄⁺

• Cl

• Br

• I

Assertion : The lactic acid shows the geometrical isomerism.

Reason : Lactic acid has carbon-carbon double bond.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Following pair is separated by yellow ammonium sulphide :

• CdS , Bi₂S₁

• Bi₂S₃ , PbS

• PbS , HgS

• CdS , Ag₂S₃

Following is estimated by Liebig method :

• C and H

• N₂

• Cl₂

• Br₂

Which colourless gas evolves when NH₄Cl reacts with zinc in a dry battery ?

• NH₃

• N₂

• H₂

• Cl₂

Quantitative measurement of nitrogen in an organic compound is done by the method :

• Berthelot method

• Belstein method

• Lassaigne test

• Kjheldahl method