JEE Main Practical Organic Chemistry Practice Questions With Solutions

Updated By Diksha Sharma on 07 Jan, 2025 21:16

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JEE Main Chemistry Practical Organic Chemistry Practice Questions

Mathematics Physics

Question 1.

Which of the following compound can give positive iodoform test when treated with aqueous $KOH$ solution followed by potassium hypoiodite.

JEE Main 2024 (Online) 9th April Evening Shift Chemistry - Practical Organic Chemistry Question 11 English Option 1

JEE Main 2024 (Online) 9th April Evening Shift Chemistry - Practical Organic Chemistry Question 11 English Option 2

JEE Main 2024 (Online) 9th April Evening Shift Chemistry - Practical Organic Chemistry Question 11 English Option 3

{CH}_{3} {CH}_{2} {CH}_{2} CHO

Question 2.

Match List I with List II

	LIST I (Test)		LIST II (Observation)
A.	${Br}_{2}$ water test	I.	Yellow orange or orange red precipitate formed
B.	Ceric ammonium nitrate test	II.	Reddish orange colour disappears
C.	Ferric chloride test	III.	Red colour appears
D.	2, 4 - DNP test	IV.	Blue, Green, Violet or Red colour appear

Choose the correct answer from the options given below:

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

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

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

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

Question 3.

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.

(D) It should be readily soluble in water.

(E) ${KMnO}_{4}$ & $NaOH$ can be used as primary standard.

Choose the correct answer from the options given below :

(A) and (B) only

(B) and (E) only

Question 4.

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

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

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

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

Question 5.

Match List I with List II

	LIST I (Name of the test)		LIST II (Reaction sequence involved) [M is metal]
A.	Borax bead test	I.	${MCO}_{3} \to MO \to_{+ Δ}^{Co {({NO}_{3})}_{2}} CoO \cdot MO$
B.	Charcoal cavity test	II.	${MCO}_{3} \to {MCl}_{2} \to M^{2 +}$
C.	Cobalt nitrate test	III.	${MSO}_{4} \to_{Δ}^{{Na}_{2} B_{4} O_{7}} M {({BO}_{2})}_{2} \to {MBO}_{2} \to M$
D.	Flame test	IV.	${MSO}_{4} \to_{Δ}^{{Na}_{2} {CO}_{3}} {MCO}_{3} \to MO \to M$

Choose the correct answer from the options given below:

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

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

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

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

Question 6.

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in ${NH}_{4} OH$ solution when sodium carbonate extract was first acidified with dil. ${HNO}_{3}$ and then ${AgNO}_{3}$ solution was added. This indicates presence of :

I^{-}

{CO}_{3}^{2 -}

{Cl}^{-}

{Br}^{-}

Question 7.

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

R_{f}

of a polar compound is smaller than that of a non-polar compound.

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

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

R_{f}

is an integral value.

Question 8.

Match List I with List II

	LIST I (Precipitating reagent and conditions)		LIST II (Cation)
A.	${NH}_{4} Cl + {NH}_{4} OH$	I.	${Mn}^{2 +}$
B.	${NH}_{4} OH + {Na}_{2} {CO}_{3}$	II.	${Pb}^{2 +}$
C.	${NH}_{4} OH + {NH}_{4} Cl + H_{2} S gas$	III.	${Al}^{3 +}$
D.	dilute $HCl$	IV.	${Sr}^{2 +}$

Choose the correct answer from the options given below:

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

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

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

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

Question 9.

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, C, D only

B, C, D only

A, B, D only

A, B, C only

Question 10.

In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :

decrease concentration of

^{-} OH

ions

increase concentration of

{Cl}^{-}

ions

prevent interference by phosphate ions

increase concentration of

{NH}_{4}^{+}

ions