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 2016 Phase 2

The compound that will react most readily with gaseous bromine has the formula
A
C3H6
B
C2H2
C
C4H10
D
C2H4

## Explanation

Propene is most reactive towards Br2 (gaseous) than CH2 = CH2, HC $$\equiv$$ CH and butane due to most electron density.
2

### NEET 2016 Phase 2

In the given reaction,

the product P is
A
B
C
D

## Explanation

3

### NEET 2016 Phase 2

Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction ?
A
B
C
D

## Explanation

4

### NEET 2016 Phase 2

In pyrrole the electron density is maximum on
A
2 and 3
B
3 and 4
C
2 and 4
D
2 and 5

## Explanation

Pyrrole has maximum electron density on 2 and 5. It generally reacts with electrophiles at the C-2 or C-5 due to the highest degree of stability of the protonated intermediate.

Attack at position 3 or 4 yields a carbocation that is a hybrid of structures (I) and (II). Attack at position 2 or 5 yields a carbocation that is a hybrid not only of structures (III) and (IV) (analogous to I and II) but also of structure (V). The extra stabilization conferred by (V) makes this ion the more stable one.

Also, attack at position 2 or 5 is faster because the developing positive charge is accommodated by three atoms of the ring instead of by only two.

### 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