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1

JEE Main 2021 (Online) 31st August Evening Shift

MCQ (Single Correct Answer)

+4

-1

Arrange the following conformational isomers of n-butane in order of their increasing potential energy :

JEE Main 2021 (Online) 31st August Evening Shift Chemistry - Basics of Organic Chemistry Question 173 English

JEE Main 2021 (Online) 31st August Evening Shift Chemistry - Basics of Organic Chemistry Question 173 English

A

II < III < IV < I

B

I < IV < III < II

C

II < IV < III < I

D

I < III < IV < II

2

JEE Main 2021 (Online) 31st August Evening Shift

MCQ (Single Correct Answer)

+4

-1

The Eu²⁺ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]

A

4f⁷6s²

B

4f⁶

C

4f⁷

D

4f⁶6s²

3

JEE Main 2021 (Online) 31st August Evening Shift

MCQ (Single Correct Answer)

+4

-1

The structures A and B formed in the following reaction are : [Ph = $$-$$C₆H₅]

JEE Main 2021 (Online) 31st August Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 156 English

JEE Main 2021 (Online) 31st August Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 156 English

A

JEE Main 2021 (Online) 31st August Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 156 English Option 1

B

JEE Main 2021 (Online) 31st August Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 156 English Option 2

C

JEE Main 2021 (Online) 31st August Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 156 English Option 3

D

JEE Main 2021 (Online) 31st August Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 156 English Option 4

4

JEE Main 2021 (Online) 31st August Evening Shift

MCQ (Single Correct Answer)

+4

-1

In which one of the following sets all species show disproportionation reaction?

A

ClO$$_2^ - $$, F₂, MnO$$_4^ - $$ and Cr₂O$$_7^{2 - }$$

B

Cr₂O$$_7^{2 - }$$, MnO$$_4^{ - }$$, ClO$$_2^{- }$$ and Cl₂

C

MnO$$_4^{ - }$$, ClO$$_2^{- }$$, Cl₂ and Mn³⁺

D

ClO$$_4^{ - }$$, MnO$$_4^{ - }$$, ClO$$_2^{ - }$$ and F₂

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