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1

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

Which one among the following resonating structures is not correct?

A

JEE Main 2021 (Online) 25th July Morning Shift Chemistry - Basics of Organic Chemistry Question 159 English Option 1

B

JEE Main 2021 (Online) 25th July Morning Shift Chemistry - Basics of Organic Chemistry Question 159 English Option 2

C

JEE Main 2021 (Online) 25th July Morning Shift Chemistry - Basics of Organic Chemistry Question 159 English Option 3

D

JEE Main 2021 (Online) 25th July Morning Shift Chemistry - Basics of Organic Chemistry Question 159 English Option 4

2

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

The correct order of following 3d metal oxides, according to their oxidation numbers is :

(a) CrO₃, (b) Fe₂O₃, (c) MnO₂, (d) V₂O₅, (e) Cu₂O

A

(d) > (a) > (b) > (c) > (e)

B

(a) > (c) > (d) > (b) > (e)

C

(a) > (d) > (c) > (b) > (e)

D

(c) > (a) > (d) > (e) > (b)

3

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

Which one of the following compounds will liberate CO₂, when treated with NaHCO₃ ?

A

$${(C{H_3})_3}\mathop {NH}\limits^ \oplus \mathop {Cl}\limits^\Theta $$

B

$${(C{H_3})_4}\mathop N\limits^ \oplus \mathop O\limits^\Theta H$$

C

JEE Main 2021 (Online) 25th July Morning Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 133 English Option 3

D

$$C{H_3}N{H_2}$$

4

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

+4

-1

An organic compound 'A' C₄H₈ on treatment with KMnO₄/H⁺ yields compound 'B' C₃H₆O.

Compound 'A' also yields compound 'B' an ozonolysis. Compound 'A' is :

A

2-Methylpropene

B

1-Methylcyclopropane

C

But-2-ene

D

Cyclobutane

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