1
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
2
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.
3
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
$$\mathrm{Me_2NH > Me_3N > MeNH_2 > NH_3}$$
4
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match the List-I with List-II :

List-I
Cations
List-II
Group reagents
A. $$\mathrm{Pb^{2+},Cu^{2+}}$$ i) $$\mathrm{H_2S}$$ gas in presence of dilute HCl
B. $$\mathrm{Al^{3+},Fe^{3+}}$$ ii) $$\mathrm{(NH_4)_2CO_3}$$ in presence of $$\mathrm{NH_4OH}$$
C. $$\mathrm{Co^{2+},Ni^{2+}}$$ iii) $$\mathrm{NH_4OH}$$ in presence of $$\mathrm{NH_4Cl}$$
D. $$\mathrm{Ba^{2+},Ca^{2+}}$$ iv) H2S in presence of NH4OH

Correct match is -

A
A $$\to$$ i, B $$\to$$ iii, C $$\to$$ iv, D $$\to$$ ii
B
A $$\to$$ i, B $$\to$$ iii, C $$\to$$ ii, D $$\to$$ iv
C
A $$\to$$ iii, B $$\to$$ i, C $$\to$$ iv, D $$\to$$ ii
D
A $$\to$$ iv, B $$\to$$ ii, C $$\to$$ iii, D $$\to$$ i
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