1

### 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.
2

### NEET 2013

The structure of isobutyl group in an organic compound is
A
B
C
D

## Explanation

3

### 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.
4

### NEET 2013

Structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is
A
B
C
D

## Explanation

IUPAC name of the structure is

3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid