Which of the following statement is correct?a)o-nitrophenol can be se...
Intramolecular hydrogen bonds are those which occur within one single molecule. This occurs when two functional groups of a molecule can form hydrogen bonds with each other
o-hydroxy benzoic acid contains intramolecular hydrogen bonding while p-hydroxy benzoic acid contains intermolecular hydrogen bonding.
As intermolecular hydrogen bond is more stable than intramolecular hydrogen bond, so it has more boiling point.
Which of the following statement is correct?a)o-nitrophenol can be se...
Explanation:
The correct statement is option C, which states that o-hydroxybenzoic acid can be separated from p-hydroxybenzoic acid because of intramolecular hydrogen bonding in o-hydroxybenzoic acid.
Intermolecular Hydrogen Bonding:
Intermolecular hydrogen bonding occurs between molecules of a substance. It is responsible for the physical properties of a substance such as boiling point, melting point, and solubility. In the case of o-nitrophenol and p-nitrophenol, both compounds have nitro groups (-NO2) attached to the benzene ring. However, o-nitrophenol can form intermolecular hydrogen bonds due to the presence of a hydroxyl group (-OH) on the ortho position of the benzene ring. This hydrogen bonding increases the boiling point and solubility of o-nitrophenol compared to p-nitrophenol.
Intramolecular Hydrogen Bonding:
Intramolecular hydrogen bonding occurs within a molecule. It involves the interaction between a hydrogen atom and an electronegative atom (such as oxygen or nitrogen) within the same molecule. In the case of o-hydroxybenzoic acid and p-hydroxybenzoic acid, both compounds have a hydroxyl group attached to the benzene ring. However, o-hydroxybenzoic acid can form intramolecular hydrogen bonds between the hydroxyl group and the carbonyl group (-COOH) within the same molecule. This intramolecular hydrogen bonding makes the molecule more stable and influences its physical and chemical properties.
Separation of o-hydroxybenzoic acid and p-hydroxybenzoic acid:
Due to the presence of intramolecular hydrogen bonding in o-hydroxybenzoic acid, the molecule is more stable compared to p-hydroxybenzoic acid. This stability results in different physical and chemical properties between the two isomers, making their separation possible. One possible method for separation is through chromatography techniques, where the different interactions between the isomers and the stationary phase can be exploited. For example, o-hydroxybenzoic acid may have a stronger interaction with the stationary phase due to intramolecular hydrogen bonding, resulting in a longer retention time compared to p-hydroxybenzoic acid.
In summary, the correct statement is option C, which correctly states that o-hydroxybenzoic acid can be separated from p-hydroxybenzoic acid due to the presence of intramolecular hydrogen bonding in o-hydroxybenzoic acid.
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