Resonance Effect

Q. In the following groups,

$\left(1\right)-OAc$

$\left(2\right)-OMe$

$\left(3\right)-OS{O}_{2}Me$

$\left(4\right)-OS{O}_{2}C{F}_3$

The order of leaving group ability is:

1. $3>2>1>4$
2. $1>2>3>4$
3. $2>3>4>1$
4. $4>3>1>2$

Q.

All bonds in benzene are equal due to?

1. Tautomerism

2. Inductive effect

3. Isomerism

4. Resonance

Q.

'$C-C$' bond length in benzene lies between single and double bond.The reason is

1. Resonance

2. Isomerism

3. Metamerism

4. Inductive effect

Q.

Which of the following is/are true?

1. Conjugated electrons migrate from one conjugate position to another.

2. Conjugated electrons are delocalised electrons.

3. Conjugation makes a compound unstable.

4. None of these.

Q. Which of the following can be a conjugate system ?

1. , Conjugation

2. Positive charge, Conjugation

3. Negative charge, Conjugation

4. Lone pair, cConjugation

Q.

Which of the following is in conjugation ?

1. $C{H}_2=CH-\stackrel{\ominus }{\stackrel{}{C}}{H}_2$

2. $C{H}_2=CH-CH=CH-\stackrel{\oplus }{C}{H}_2$

3. $C{H}_2=CH-\stackrel{..}{N}{H}_2$

4. $C{H}_2=CH-CH=CH-\stackrel{\oplus }{C}{H}_2$

Q. The correct statement(s) concerning the structures E, F and G is/are

1. E, F and G are resonance structures
2. E, F and E, G are tautomers
3. F and G are geometrical isomers
4. F and G are chain isomers

Q. Resonance effect is due to

1. Migration of proton
2. Delocalisation of pi electrons
3. Migration of H-atom
4. Delocalisation of sigma electrons

Q. Resonance in most organic compounds

1. Increases stability
2. Decreases reactivity
3. Increases reactivity
4. Both A & B

Q.

Pyridine has 6 bonding ( $\pi$ ) and 2 nonbonding electrons, which statement is true regarding resonance in pyridine?

1. Any of the 6 electrons

2. All of these electrons are involved in resonance
   
   

3. $4\pi$ and 2 non-bonding electrons are involved in resonance
   

4. Only $6\pi$ electrons are involved in resonance