1
JEE Main 2026 (Online) 21st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List - I with List - II.

List - I
Pair of Compounds
List - II
Type of Isomers
A. 2-Methylpropene and but-1-ene I. Stereoisomers
B. Cis-but-2-ene and trans-but-2-ene II. Position isomers
C. 2-Butanol and diethyl ether III. Chain isomers
D. But-1-ene and but-2-ene IV. Functional group isomers

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

2
JEE Main 2026 (Online) 21st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct increasing order of C–H(A), C–O(B), C=O(C) and C≡N(D) bonds in terms of covalent bond length is :

A

D < C < B < A

B

D < C < A < B

C

A < B < C < D

D

A < D < C < B

3
JEE Main 2026 (Online) 21st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements :

Statement I : The correct order in terms of atomic/ionic radii is Al > Mg > Mg2+ > Al3+.

Statement II : The correct order in terms of the magnitude of electron gain enthalpy is Cl > Br > S > O.

In the light of the above statements, choose the correct answer from the options given below :

A

Statement I is true but Statement II is false

B

Both Statement I and Statement II are true

C

Statement I is false but Statement II is true

D

Both Statement I and Statement II are false

4
JEE Main 2026 (Online) 21st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
For a closed circuit Daniell cell, which of the following plots is the accurate one at a given temperature?
A
JEE Main 2026 (Online) 21st January Evening Shift Chemistry - Electrochemistry Question 21 English Option 1
B
JEE Main 2026 (Online) 21st January Evening Shift Chemistry - Electrochemistry Question 21 English Option 2
C
JEE Main 2026 (Online) 21st January Evening Shift Chemistry - Electrochemistry Question 21 English Option 3
D
JEE Main 2026 (Online) 21st January Evening Shift Chemistry - Electrochemistry Question 21 English Option 4

JEE Main Papers

All year-wise previous year question papers

2023
2021