NEW
New Website Launch
Experience the best way to solve previous year questions with mock tests (very detailed analysis), bookmark your favourite questions, practice etc...
1

### NEET 2013 (Karnataka)

Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?
A
Fe3[Fe(CN)6]2
B
Fe4[Fe(CN)6]3
C
Fe4[Fe(CN)6]2
D
Fe3[Fe(CN)6]3

## Explanation

The prussian blue colour is of Fe4 [Fe(CN)6]3 ferric ferrocyanide.
2

### NEET 2013 (Karnataka)

What is the hybridisation state of benzyl carbonium ion?

A
sp2
B
spd2
C
sp2d
D
sp3
3

### NEET 2013 (Karnataka)

Arrange the following in increasing order of stability
A
5 < 4 < 3 < 1< 2
B
4 < 5 < 3 < 1 < 2
C
1 < 5 < 4 < 3 < 2
D
5 < 4 < 3 < 2 < 1

## Explanation

Greater the number of e donating alkyl groups (+I effect), greater will be the stability of carbocations.
4

### NEET 2013

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating ?
A
$$-$$COOH
B
$$-$$ NO2
C
$$-$$ C $$\equiv$$ N
D
$$-$$ SO3H

## Explanation

$$-$$ NO2 is most deactivating due to -I ans -M effect.

### Joint Entrance Examination

JEE Main JEE Advanced WB JEE

### Graduate Aptitude Test in Engineering

GATE CSE GATE ECE GATE EE GATE ME GATE CE GATE PI GATE IN

NEET

Class 12