1
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In comparison to boron, berylium has :
A
lesser nuclear charge and greater first ionisation enthalpy
B
greater nuclear charge and greater first ionisation enthalpy
C
greater nuclear charge and lesser first ionisation enthalpy
D
lesser nuclear charge and lesser first ionisation ethalpy
2
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The pair that has similar atomic radii is :
A
Mo and W
B
Mn and Fe
C
Ti and Hf
D
Sc and Ni
3
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
25 g of an unknown hydrocarbon upon burning produces 88 g of CO2 and 9 g of H2O. This unknown hydrocarbon contains :
A
18 g of carbon and 7 g of hydrogen
B
20 g of carbon and 5 g of hydrogen
C
22 g of carbon and 3 g of hydrogen
D
24 g of carbon and 1 g of hydrogen
4
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
What will be the major product when m-cresol is reacted with propargyl bromide (HC$$ \equiv $$C–CH2Br) in presence of K2CO3 in acetone?
A
JEE Main 2019 (Online) 12th April Evening Slot Chemistry - Alcohols, Phenols and Ethers Question 139 English Option 1
B
JEE Main 2019 (Online) 12th April Evening Slot Chemistry - Alcohols, Phenols and Ethers Question 139 English Option 2
C
JEE Main 2019 (Online) 12th April Evening Slot Chemistry - Alcohols, Phenols and Ethers Question 139 English Option 3
D
JEE Main 2019 (Online) 12th April Evening Slot Chemistry - Alcohols, Phenols and Ethers Question 139 English Option 4

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