Stability of Carbocation

Q. Which of the following carbocations is expected to be most stable?

1. 
2. 
3. 
4. 

Q.

In each of the following pairs of ions which ion is more stable?

1. I, I, II, II

2. II, II, I, I

3. I, I, I, I

4. II, II, II, II

Q. The order stability of the following carbocations:

1. I > II > III
2. III > I > II
3. III > II > I
4. II > III > I

Q. Select the most stable carbocation among the following?

1. 

2. 

3. 

4. 

Q.

Which of the following is most stable?

1. 

2. 

3. 

4. 

Q. Which of the following carbocation is least stable

1. 

2. 

3. 

4. 

Q. The order of stability of the following carbocations
$C{H}_2=\underset{\left(I\right)}{CH}-\stackrel{\oplus }{C{H}_2};C{H}_3-\underset{\left(II\right)}{C{H}_2}-\stackrel{\oplus }{C}{H}_2;$ is

1. III > II > I
2. II > III > I
3. III > I > II
4. I > II > III

Q.

A solution of (-) - 1 - chloro - 1 - phenylethane in toluene racemises slowly in the presence of a small amount of $SbC{l}_5$, due to the formation of :

1. carbene

2. carbocation

3. free radical

4. carbanion

Q.

Arrange the following carbocations in decreasing order of stability

1. IV > III > I > V > II
   

2. IV > I > III > II > V
   

3. V > IV > I > III > II
   

4. V > IV > III > I > II

Q.

The compound that gives the most stable carbonium ion on dehydration is:

1. 

2. 

3. 

4.