1
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

From the figure of column chromatography given below, identify incorrect statements.

JEE Main 2023 (Online) 6th April Evening Shift Chemistry - Basics of Organic Chemistry Question 64 English

A. Compound 'c' is more polar than 'a' and 'b'

B. Compound '$$\mathrm{a}$$' is least polar

C. Compound 'b' comes out of the column before 'c' and after 'a'

D. Compound 'a' spends more time in the column

Choose the correct answer from the options given below:

A
B and D only
B
B, C and D only
C
A, B and D only
D
A, B and C only
2
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Resonance in carbonate ion $$\left(\mathrm{CO}_{3}{ }^{2-}\right)$$ is

JEE Main 2023 (Online) 1st February Morning Shift Chemistry - Basics of Organic Chemistry Question 82 English

Which of the following is true?

A
It is possible to identify each structure individually by some physical or chemical method.
B
All these structures are in dynamic equilibrium with each other.
C
Each structure exists for equal amount of time.
D
$$\mathrm{CO}_{3}{ }^{2-}$$ has a single structure i.e., resonance hybrid of the above three structures.
3
JEE Main 2023 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match items of column I and II

Column I (Mixture of compounds) Column II (Separation Technique)
A. $$\mathrm{H_2O/CH_2Cl_2}$$ i. Crystalization
B. JEE Main 2023 (Online) 31st January Morning Shift Chemistry - Basics of Organic Chemistry Question 80 English ii. Differential solvent extraction
C. Kerosene / Naphthalene iii. Column chromatography
D. $$\mathrm{C_6H_{12}O_6/NaCl}$$ iv. Fractional Distillation

Correct match is

A
A-(ii), B-(iv), C-(i), D-(iii)
B
A-(iii), B-(iv), C-(ii), D-(i)
C
A-(i), B-(iii), C-(ii), D-(iv)
D
A-(ii), B-(iii), C-(iv), D-(i)
4
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II:

List I (Mixture) List II (Separation Technique)
A. $\mathrm{CHCl}_3+\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2$ I. Steam distillation
B. $\mathrm{C}_6 \mathrm{H}_{14}+\mathrm{C}_5 \mathrm{H}_{12}$ II. Differential extraction
C. $\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2+\mathrm{H}_2 \mathrm{O}$ III. Distillation
D. $\text { Organic compound in } \mathrm{H}_2 \mathrm{O}$ IV. Fractional distillation
A
A-III, B-I, C-IV, D-II
B
A-II, B-I, C-III, D-IV
C
A-IV, B-I, C-III, D-II
D
A-III, B-IV, C-I, D-II
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