1
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The secondary structure of protein is stabilised by:
A
Hydrogen bonding
B
glycosidic bond
C
Peptide bond
D
van der Waals forces
2
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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
3
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Identify the elements X and Y using the ionisation energy values given below :

Ionization energy (kJ/mol)
1$${st}$$ 2$${nd}$$
X 495 4563
Y 731 1450
A
X = F; Y = Mg
B
X = Mg; Y = F
C
X = Na; Y = Mg
D
X = Mg; Y = Na
4
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
JEE Main 2021 (Online) 16th March Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 119 English
In the above reaction, the reagent ''A'' is :
A
LiAlH4
B
NaBH4, H3O+
C
HCl, Zn $$-$$ Hg
D
Alkaline KMnO4, H+
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