1
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: JEE Main 2023 (Online) 30th January Evening Shift Chemistry - Hydrocarbons Question 21 English 1 can be easily reduced using $\mathrm{Zn}-\mathrm{Hg} / \mathrm{HCl}$ to JEE Main 2023 (Online) 30th January Evening Shift Chemistry - Hydrocarbons Question 21 English 2

Reason $\mathrm{R}: \mathrm{Zn}-\mathrm{Hg} / \mathrm{HCl}$ is used to reduce carbonyl group to $-\mathrm{CH}_{2}-$ group.

In the light of the above statements, choose the correct answer from the options given below:
A
${ \text {Both } A \text { and }} \mathrm{R}$ are true and $\mathrm{R}$ is the correct explanation of $\mathrm{A}$
B
$\mathrm{A}$ is false but $\mathrm{R}$ is true
C
A is true but $\mathrm{R}$ is false
D
Both $\mathrm{A}$ and $\mathrm{R}$ are true but $\mathrm{R}$ is not the correct explanation of $\mathrm{A}$
2
JEE Main 2023 (Online) 30th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The major products 'A' and 'B', respectively, are

JEE Main 2023 (Online) 30th January Morning Shift Chemistry - Hydrocarbons Question 20 English

A
JEE Main 2023 (Online) 30th January Morning Shift Chemistry - Hydrocarbons Question 20 English Option 1
B
JEE Main 2023 (Online) 30th January Morning Shift Chemistry - Hydrocarbons Question 20 English Option 2
C
JEE Main 2023 (Online) 30th January Morning Shift Chemistry - Hydrocarbons Question 20 English Option 3
D
JEE Main 2023 (Online) 30th January Morning Shift Chemistry - Hydrocarbons Question 20 English Option 4
3
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The one giving maximum number of isomeric alkenes on dehydrohalogenation reaction is (excluding rearrangement)

A
2-Bromo-3,3-dimethylpentane
B
2-Bromopropane
C
1-Bromo-2-methylbutane
D
2-Bromopentane
4
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The isomeric deuterated bromide with molecular formula $$\mathrm{C_4H_8DBr}$$ having two chiral carbon atoms is

A
2 - Bromo - 1 - deuterobutane
B
2 - Bromo - 1 - deutero - 2 - methylpropane
C
2 - Bromo - 3 - deuterobutane
D
2 - Bromo - 2 - deuterobutane
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