JEE Main 2021 (Online) 16th March Evening Shift | JEE Main Year Wise Previous Years Questions - ExamSIDE.Com

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1

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

+4

-1

Which of the following is least basic?

A

$${(C{H_3}CO)_2}\mathop N\limits^{..} H$$

B

$$(C{H_3}CO)\mathop N\limits^{..} H{C_2}{H_5}$$

C

$${({C_2}{H_5})_3}\mathop N\limits^{..} $$

D

$${({C_2}{H_5})_2}\mathop N\limits^{..} H$$

2

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

+4

-1

Ammonolysis of Alkyl halides followed by the treatment with NaOH solution can be used to prepare primary, secondary and tertiary amines. The purpose of NaOH in the reaction is :

A

to remove acidic impurities

B

to remove basic impurities

C

to activate NH₃ used in the reaction

D

to increase the reactivity of alkyl halide

3

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

+4

-1

The secondary structure of protein is stabilised by:

A

Hydrogen bonding

B

glycosidic bond

C

Peptide bond

D

van der Waals forces

4

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

+4

-1

Fex₂ and Fey₃ are known when x and y are :

A

x = F, Cl, Br, I and y = F, Cl, Br, I

B

x = F, Cl, Br and y = F, Cl, Br, I

C

x = F, Cl, Br, I and y = F, Cl, Br

D

x = Cl, Br, I and y = F, Cl, Br, I

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