JEE MAINS Organic Quiz

In chromatography technique, the purification of a compound is independent of:

• Mobility or flow of solvent system

• Solubility of the compound

• Length of the column or Plate

• Physical state of the pure compound

The principle of column chromatography is:

• Differential adsorption of the substances on the solid phase.

• Differential absorption of the substances on the solid phase.

• Gravitational force.

• Capillary action

A solution of chloroaniline, chlorophenol and chlorobenzoic acid in ethyl acetate was extracted

initially with a saturated solution of to give fraction . The left over organic phase was extracted

with dilute solution to give fraction . The final organic layer was labelled as fraction . Fractions

and contain respectively:

• m-chlorobenzoic acid, m-chloroaniline and m-chlorophenol

• m-chlorobenzoic acid, m-chlorophenol and m-chloroaniline

• m-chlorophenol, m-chlorobenzoic acid and m-chloroanilinc

• m-chloroaniline, m-chlorobenzoic acid and m-chlorophenol

In the estimation of bromine, of an organic compound gave of silver bromide. The percentage of

bromine in the given compound is (nearest integer)

(Relative atomic masses of and are and , respectively).

(a)  

Which of these factors does not govern the stability of a conformation in acyclic compounds?

• Steric interactions

• Angle strain

• Torsional strain

• Electrostatic forces of interaction

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as

Assertion (A): A simple distillation can be used to separate a mixture of propanol and propanone.

Reason (R): Two liquids with a difference of more than in their boiling points can be separated by simple

distillations.

• Both (A) and (R) are correct but (R) is not the correct explanation of (A).

• Both (A) and (R) are correct and (R) is the correct explanation of (A).

• (A) is true but (R) is false.

• (A) is false but (R) is true.

In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of:

• HNO3

• AgNO3

• CuSO4

• BaSO4

Given below are two statements:

Statement-I: Retardation factor can be measured in meter/centimetre.

Statement-II: value of a compound remains constant in all solvents.

Choose the most appropriate answer from the options given below:

• Statement-I is true but statement-II is false

• Both statement-I and statement-II are true

• Both statement-I and statement-II are false

• Statement-I is false but statement-II is true

The separation of two coloured substances was done by paper chromatography. The distances travelled by

solvent front, substance and substance from the base line are and .

respectively. The ratio of values of to is (Answer the nearest integer)

(a)  

Polysubstitution is a major drawback in:

• Reimer Tiemann reaction

• Friedel Craft's alkylation

• Acetylation of aniline

• Friedel Craft's acylation