1
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The pair of metal ions that can give a spin only magnetic moment of 3.9 BM for the complex [M(H2O)6]Cl2, is -
A
V2+ and Fe2+
B
V2+ and Co2+
C
Co2+ and Fe2+
D
Cr2+ and Mn2+
2
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Among the following four aromatic compounds, which one will have the lowest melting point ?
A
JEE Main 2019 (Online) 12th January Morning Slot Chemistry - Basics of Organic Chemistry Question 172 English Option 1
B
JEE Main 2019 (Online) 12th January Morning Slot Chemistry - Basics of Organic Chemistry Question 172 English Option 2
C
JEE Main 2019 (Online) 12th January Morning Slot Chemistry - Basics of Organic Chemistry Question 172 English Option 3
D
JEE Main 2019 (Online) 12th January Morning Slot Chemistry - Basics of Organic Chemistry Question 172 English Option 4
3
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In the following reaction :

Aldehyde + Alcohol   $$\buildrel {HCl} \over \longrightarrow $$  Acetal

Aldehyde                    Alcohol
HCHO tBuOH
CH3CHO MeOH

The best combination is
A
CH3CHO and MeOH
B
HCHO and MeOH
C
CH3CHO and tBuOH
D
HCHO and tBuOH
4
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
If the sum of the deviations of 50 observations from 30 is 50, then the mean of these observations is :
A
31
B
50
C
51
D
30
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