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The order of activites of the various Or...

The order of activites of the various Ortho and Para director is

A

`-O^(-) gt -OH gt - OCOCH_(3) gt -COCH_(3)`

B

`-OH gt -O^(-) gt -OCOCH_(3) gt -COCH_(3)`

C

`-OH gt -O^(-) gt -COCH_(3) gt -OCOCH_(3)`

D

`-O^(-) gt -COCH_(3) gt -OCOCH_(3) gt -OH`

Text Solution

AI Generated Solution

The correct Answer is:
To determine the order of activities of various ortho and para directors, we need to analyze the substituents attached to the benzene ring and their effects on the electron density of the ring. Here’s a step-by-step solution: ### Step 1: Identify the substituents We have four substituents to consider: 1. O^− (alkoxide ion) 2. OH (hydroxyl group) 3. OCOCH3 (acetoxy group) 4. COCH3 (acetyl group) ### Step 2: Understand the directing effects Ortho and para directors are typically electron-donating groups. They can increase the electron density of the benzene ring, making it more reactive towards electrophilic substitution. The strength of their directing ability can be influenced by the presence of lone pairs or negative charges. ### Step 3: Analyze the substituents 1. **O^− (alkoxide ion)**: This group has a negative charge, which significantly increases the electron density of the ring. It is expected to be the strongest ortho and para director. 2. **OH (hydroxyl group)**: This group has a lone pair of electrons that can participate in resonance with the ring, making it a good ortho and para director, but not as strong as the alkoxide ion. 3. **OCOCH3 (acetoxy group)**: This group has a lone pair on the oxygen, but it is less effective than the hydroxyl group because the acetoxy group can withdraw some electron density through resonance. 4. **COCH3 (acetyl group)**: This group is a deactivating group because it withdraws electron density from the ring, making it a weak ortho and para director. ### Step 4: Order the substituents based on their directing ability Based on the analysis: 1. O^− (alkoxide ion) - strongest ortho and para director 2. OH (hydroxyl group) - second strongest 3. OCOCH3 (acetoxy group) - weaker than hydroxyl 4. COCH3 (acetyl group) - weakest ortho and para director ### Final Order of Activities Thus, the order of activities of the various ortho and para directors is: 1. O^− > OH > OCOCH3 > COCH3
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