1
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The radius of the $$\mathrm{2^{nd}}$$ orbit of $$\mathrm{Li^{2+}}$$ is $$x$$. The expected radius of the $$\mathrm{3^{rd}}$$ orbit of $$\mathrm{Be^{3+}}$$ is

A
$$\frac{16}{27}x$$
B
$$\frac{4}{9}x$$
C
$$\frac{9}{4}x$$
D
$$\frac{27}{16}x$$
2
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following conformations will be the most stable?

A
JEE Main 2023 (Online) 25th January Morning Shift Chemistry - Basics of Organic Chemistry Question 47 English Option 1
B
JEE Main 2023 (Online) 25th January Morning Shift Chemistry - Basics of Organic Chemistry Question 47 English Option 2
C
JEE Main 2023 (Online) 25th January Morning Shift Chemistry - Basics of Organic Chemistry Question 47 English Option 3
D
JEE Main 2023 (Online) 25th January Morning Shift Chemistry - Basics of Organic Chemistry Question 47 English Option 4
3
JEE Main 2023 (Online) 25th January Morning 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 : Acetal / Ketal is stable in basic medium.

Reason R : The high leaving tendency of alkoxide ion gives the stability to acetal/ketal in basic medium.

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

A
A is false but R is true.
B
Both A and R are true but R is NOT the correct explanation of A
C
Both A and R are true and R is the correct explanation of A
D
A is true but R is false.
4
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct order in aqueous medium of basic strength in case of methyl substituted amines is :

A
$$\mathrm{NH_3 > Me_3N > MeNH_2 > Me_2NH}$$
B
$$\mathrm{Me_3N > Me_2NH > MeNH_2 > NH_3}$$
C
$$\mathrm{Me_2NH > MeNH_2 > Me_3N > NH_3}$$
D
$$\mathrm{Me_2NH > Me_3N > MeNH_2 > NH_3}$$
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