1
JEE Main 2026 (Online) 21st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
$$ \text { From the following, the least stable structure is : } $$
A
B
C
D
2
JEE Main 2026 (Online) 21st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Identify correct statements from the following :
A. Propanal and propanone are functional isomers.
B. Ethoxyethane and methoxypropane are metamers.
C. But-2-ene shows optical isomerism.
D. But-1-ene and but-2-ene are functional isomers.
E. Pentane and 2, 2-dimethyl propane are chain isomers.
Choose the correct answer from the options given below :
3
JEE Main 2025 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match the LIST-I with LIST-II
| LIST-I | LIST-II |
|---|---|
| A. Carbocation | I. Species that can supply a pair of electrons. |
| B. C-Free radical | II. Species that can receive a pair of electrons. |
| C. Nucleophile | III. sp2 hybridized carbon with empty p-orbital. |
| D. Electrophile | IV. sp2/sp3 hybridized carbon with one unpaired electron. |
Choose the correct answer from the options given below:
4
JEE Main 2025 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
What is the correct IUPAC name of the compound?
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