JEE Main 2021 Question Paper (31-Aug-2021) (Shift 1)

Question 1

Which one of the following compounds contains $ \beta -\mathrm{C}_{1}-\mathrm{C}_{4} $ glycosidic linkage?

Accepted Answer

Lactose

Answer

Sucrose

Answer

Amylose

Answer

Maltose

Question 2

The denticity of an organic ligand, biuret, is :

Accepted Answer

$2$

Answer

$3$

Answer

$4$

Answer

$6$

Question 3

The major product formed in the following reaction is :

Accepted Answer

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Answer

Answer

Answer

Question 4

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Treatment of bromine water with propene yields 1-bromopropan-2-ol.
Reason (R): Attack of water on bromonium ion follows Markovnikov rule and results in 1-bromopropan-2-ol.
In the light of the above statements, choose the most appropriate answer from the options given below :

Accepted Answer

Both (A) and (R) are true and (R) is the correct explanation of (A).

Answer

Both (A) and (R) are true but (R) is NOT the correct explanation of (A).

Answer

(A) is false but (R) is true.

Answer

(A) is true but (R) is false.

Question 5

Select the graph that correctly describes the adsorption isotherms at two temperatures $ {\mathrm{T}}_{1} $ and $ {\mathrm{T}}_{2} \left( \quad {\mathrm{T}}_{1} > {\mathrm{T}}_{2} \right) $ for a gas :
($ x $ - mass of the gas adsorbed, $ m $ - mass of adsorbent, $ P $ - pressure )

Accepted Answer

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Answer

Answer

Answer