Which of the following statement is correct?a)The -OH group in phenol is meta directing.b)The electron releasing groups increase the acidic character of phenols.c)Phenols are less acidic than aromatic alcohols.d)Boiling point of phenol is higher than that of toluene of comparable molecular mass.Correct answer is option 'D'. Can you explain this answer?

Question

Answer

There is a hydrogen bonding in phenol whereas there is no such bonding in toulene . That's why boiling point of phenol is higher than that of toluene of comparable molecular mass.

Answer

The correct answer is Option D.

Phenols have higher boiling point than toluene due to the presence of intermolecular hydrogen bonding in phenols. The formation of hydrogen bonds increases the intermolecular force of attraction between the phenol molecules and thereby increases its boiling point.

Answer

Phenol is more acidic than aromatic alcohols

Explanation:

Phenol is a compound that contains an -OH group attached to an aromatic ring. The acidity of phenol is determined by the stability of the phenoxide ion formed when it loses a proton. The stability of the phenoxide ion is influenced by the electron-donating or electron-withdrawing groups attached to the aromatic ring.

Electron-releasing groups increase the acidic character of phenols

When electron-releasing groups, such as alkyl groups (-CH3, -C2H5) are attached to the aromatic ring, they donate electron density to the ring. This increases the stability of the phenoxide ion, making phenol more acidic. Therefore, the statement 'The electron releasing groups increase the acidic character of phenols' is correct.

Phenols are more acidic than aromatic alcohols

Phenols are more acidic than aromatic alcohols because the oxygen atom in the phenol's -OH group can delocalize the negative charge that forms when the -OH group loses a proton. This delocalization is possible due to the resonance stabilization provided by the aromatic ring. In contrast, aromatic alcohols lack this resonance stabilization and therefore, are less acidic than phenols. Thus, the statement 'Phenols are less acidic than aromatic alcohols' is incorrect.

Boiling point of phenol is higher than that of toluene of comparable molecular mass

The boiling point of a compound depends on the strength of its intermolecular forces. Phenol has hydrogen bonding due to the presence of the -OH group, which leads to stronger intermolecular forces compared to toluene, which lacks an -OH group. Therefore, phenol has a higher boiling point than toluene of comparable molecular mass. Thus, the statement 'Boiling point of phenol is higher than that of toluene of comparable molecular mass' is correct.

Conclusion

In conclusion, the correct statement is option 'D'. The boiling point of phenol is higher than that of toluene of comparable molecular mass due to the presence of hydrogen bonding in phenol.

Answer

THERE IS FORMATION OF H-BONDING BETWEEN TWO MOLECULES OF PHENOL.SO ATTRACTION BETWEEN TWO ADJACENT PHENOL MOLECULES IS STRONGER IN IT THAN TOLUENE OF COMPARABLE MASS BECAUSE TOLUENE CAN NOT FORM H-BOND BETWEEN ITS MOLECULES.AND DUE TO THIS IT HAS A LOW BOILING POINT THAN PHENOL.

Answer

The correct answer is Option D.

Phenols have higher boiling point than toluene due to the presence of intermolecular hydrogen bonding in phenols. The formation of hydrogen bonds increases the intermolecular force of attraction between the phenol molecules and thereby increases its boiling point.

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