Directive Influence of Substituents

Q.

Is sodium an electrophile?

Q. Which one of the following will undergo meta substitution on monochlorination

1. Ethoxy ethane
2. Chlorobenzene
3. Ethyl benzoate

4. Phenol

Q. Nitrobenzene reacts with $B{r}_2$ in the presence of $FeB{r}_3$ to give m-bromonitrobenzene as the major product. Which of the following provides the best reason for the formation of m-bromonitrobenzene as the major product?

1. The electron density at the meta position is lesser than those at the ortho and para positions
2. Aromaticity is lost in the $\sigma$- complexes formed by the attack of $B{r}^{+}$ at the ortho and para positions but not at the meta position
3. The $\sigma -$ complex formed by the attachment of $B{r}^{+}$ at the meta position is the least destabilized and the most stable among the three $\sigma -$ complexes
4. In the final step of regeneration of benzene ring but the loss of $H^{+}$ from the $\sigma -$ complexes, the meta oriented $\sigma -$ complex loses $H^{+}$ most readily.

Q. Match the column I and II.

1. $\text{a}-\text{q},\text{s};\text{b}-\text{p},\text{r};\text{c}-\text{p},\text{r};\text{d}-\text{q},\text{s}$
2. $\text{a}-\text{q},\text{s};\text{b}-\text{p},\text{s};\text{c}-\text{p},\text{r};\text{d}-\text{q},\text{s}$
3. $\text{a}-\text{q},\text{r};\text{b}-\text{p},\text{r};\text{c}-\text{p},\text{r};\text{d}-\text{p},\text{s}$
4. $\text{a}-\text{q},\text{s};\text{b}-\text{p},\text{r};\text{c}-\text{p},\text{s};\text{d}-\text{q},\text{s}$

Q. In benzene 1, 3 position is called

1. Meta
2. Para
3. Ortho
4. Odd position

Q. In benzene 1, 3 position is called

1. Meta
2. Para
3. Ortho
4. Odd position