Which of the following is/are correct statement :

Options

A.
B.
C.
D.

Answer

To solve the question regarding the correctness of the statements about the electron density and dipole moments of different compounds, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Analyzing Statement A:**
- The statement compares phenoxide, acetylphenolate, and toluene in terms of electron density.
- Phenoxide has a negative charge on oxygen, which can donate electron density to the benzene ring. This increases the electron density.
- Acetylphenolate has an acetyl group (OCOCH3) which decreases the electron donating ability of the oxygen due to its electron-withdrawing nature.
- Toluene has a methyl group which also donates electron density, but it is less effective than the phenoxide.
- Therefore, the order of electron density is:
**Phenoxide > Acetylphenolate > Toluene**.
- **Conclusion:** Statement A is correct.

2. **Analyzing Statement B:**
- This statement compares OCOCH3 (acetoxy), OH (hydroxy), and CN (cyano) groups.
- Both OCOCH3 and OH are electron-donating groups (plus R groups), but OCOCH3 is a stronger electron donor than OH due to the methyl group.
- The CN group is an electron-withdrawing group (minus R group) and decreases electron density.
- Hence, the order of electron density is:
**OCOCH3 > OH > CN**.
- **Conclusion:** Statement B is also correct.

3. **Analyzing Statement C:**
- This statement claims that all given compounds are aromatic.
- Aromaticity requires a compound to be cyclic, planar, and follow Hückel's rule (4n + 2 π electrons).
- If there are two benzene rings in the structure and they do not satisfy the aromaticity criteria, then they cannot be considered aromatic.
- Therefore, if any compound does not meet the criteria, the statement is incorrect.
- **Conclusion:** Statement C is incorrect.

4. **Analyzing Statement D:**
- This statement discusses the dipole moments of three compounds.
- In a para-substituted compound, the bond moments can cancel each other out if they are 180 degrees apart, resulting in a dipole moment of zero.
- For compounds with bond angles of 60 degrees and 120 degrees, the resultant dipole moments can be calculated.
- The compound with the highest dipole moment will be the one with the least cancellation of bond moments.
- The order of dipole moments is:
**Highest > Medium > Zero**.
- **Conclusion:** Statement D is correct.

### Final Conclusion:
- The correct statements are A, B, and D.
- Statement C is incorrect.