JEE Main 2024 (Online) 9th April Morning Shift | Practical Organic Chemistry Question 4 | Chemistry

1

JEE Main 2024 (Online) 9th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

Identify the incorrect statements regarding primary standard of titrimetric analysis.

(A) It should be purely available in dry form.

(B) It should not undergo chemical change in air.

(C) It should be hygroscopic and should react with another chemical instantaneously and stoichiometrically.

(D) It should be readily soluble in water.

(E) $$\mathrm{KMnO}_4$$ & $$\mathrm{NaOH}$$ can be used as primary standard.

Choose the correct answer from the options given below :

A

(C) and (E) only

B

(A) and (B) only

C

(B) and (E) only

D

(C) and (D) only

2

JEE Main 2024 (Online) 8th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

Match List I with List II

	LIST I (Test)		LIST II (Identification)
A.	Bayer's test	I.	Phenol
B.	Ceric ammonium nitrate test	II.	Aldehyde
C.	Phthalein dye test	III.	Alcoholic-OH group
D.	Schiff's test	IV.	Unsaturation

Choose the correct answer from the options given below :

A

(A)-(IV), (B)-(I), (C)-(II), (D)-(III)

B

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

C

(A)-(II), (B)-(III), (C)-(IV), (D)-(I)

D

(A)-(IV), (B)-(III), (C)-(I), (D)-(II)

3

JEE Main 2024 (Online) 6th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

The correct statement among the following, for a "chromatography" purification method is :

A

$$\mathrm{R}_f$$ of a polar compound is smaller than that of a non-polar compound.

B

Non-polar compounds are retained at top and polar compounds come down in column chromatography.

C

Organic compounds run faster than solvent in the thin layer chromatographic plate.

D

$$\mathrm{R}_f$$ is an integral value.

4

JEE Main 2024 (Online) 6th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

Which of the following statements are correct?

A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point.

B. Aniline can be purified by steam distillation as aniline is miscible in water.

C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope.

D. An organic compound is pure, if mixed M.P. is remained same.

Choose the most appropriate answer from the options given below :

A

A, C, D only

B

B, C, D only

C

A, B, D only

D

A, B, C only