+R Effect

Q.

The movement of electrons in which one of the structure is not shown correctly?

1. 

2. 

3. 

4. 

Q.

The most stable enolic form of 2, 4-pentanedione

1. 

2. 

3. 

4. 

Q.

The basicity of aniline is less than cyclohexylamine. This is due to:

1. -R effect of amine group

2. -I effect of amine group

3. +R effect of amine group

4. Hyperconjugation effect

Q. Which of the following group will show $+R$ effect?

1. $-CHO$
2. $-N{O}_2$
3. $-N{H}_2$
4. $-COC{H}_3$

Q. Arrange stability of the given carbocations in decreasing order

1. i > ii > iii > iv
2. iii > i > ii > iv
3. ii > iii > i > iv
4. iii > ii > i > iv

Q. The least stable resonating structure of phenol is :

1. $\left(III\right)$
2. $\left(IV\right)$
3. $\left(II\right)$
4. $\left(I\right)$

Q. How many resonating structures are possible for chlorobenzene?

1. 6
2. 5
3. 3
4. 4

Q. Which effect will be shown by the functional group present in the given molecule?

1. $+M$ or $+R$
2. $-M$ or $-R$
3. $+I$
4. Both (a) and (c)

Q. The total number of resonating structure of phenoxide ion :

1. 5
2. 6
3. 3
4. 4

Q. Which of the following group(s) show $+M$ effect?

1. $-\stackrel{-}{C}{H}_2$
2. $-NHCOR$
3. $-O^{-}$
4. $-OH$