Question

Difference b/w 1-naphthol and 2-naphthol

Answer 1

Have you ever walked into an elderly person's closet and immediately noticed a strange and pungent odor? It's a distinctive scent to which younger generations aren't accustomed, since the product emitting the scent has been phased out in recent years. What's responsible for the smell, you ask? It's called mothballs. In order to keep moths and other insects from damaging textiles, mothballs were placed in clothes to serve as a fumigant.
The main ingredient in traditional mothballs is a compound called naphthalene, a polyaromatic hydrocarbon. Polyaromatic refers to the fact that the compound is made up of more than one benzene ring and hydrocarbon means it's only made of carbon and hydrogen atoms. Today we'll learn about a derivative of naphthalene called naphthol. Naphthol is very similar to its parent compound, as it only differs from naphthalene by a hydroxyl (-OH) group. Let's look together at some important features of this molecule!

Structure

Naphthol is composed of a hydroxyl group bonded to a naphthalene ring. Naphthol can exist as one of two isomers (compounds with the same chemical formula, but different atom connectivity): 1-naphthol or 2-naphthol. The two isomers differ by which carbon in the naphthalene ring the hydroxyl group is bonded to.

Isomers of naphthol: 1-naphthol and 2-naphthol

Another important structural feature of naphthol is that it's aromatic. Characteristic of aromatics, it has alternating double and single bonds throughout its rings.

Polarity

Since naphthol contains a hydroxyl group, it's a highly polar molecule, with the oxygen atom attracting electron density through the bonds toward itself. For a molecule to be polar, there has to be a difference in electronegativity (the ability of an atom to attract electrons to itself) between one or more atoms, and in the case of naphthol, oxygen is more electronegative than both carbon and hydrogen. For this reason, it can 'hog' more of the electron density in the form of the bonds, making it polar.

Polarity of naphthol

Solubility

In terms of the solvents that naphthol is soluble in (things it will form solutions with), it's very versatile. Because of the presence of the hydroxyl group, it can hydrogen bond with other alcohol-based (polar) solvents like ethanol, methanol, and isopropanol. The ability to form these hydrogen bonds makes it readily soluble in these kinds of solvents. For example, consider the case of 2-naphthol forming hydrogen bonds with methanol molecules:

Hydrogen bonding capability of 2-naphthol with methanol

Answer 2

Answer:

1-naphthol:

The molecular formula for 1-naphthol, often known as α-naphthol, is C10H7OH. It is completely white. It is an isomer of 2-naphthalene that varies in the position of the hydroxyl group on the molecule. The hydroxyl group inside the naphthols is more energetic than it is in phenols because they are naphthalene theme of identity of phenol.

2-naphthol:

The chemical compound C10H7OH, often known as 2-naphthol or β-naphthol, is a fluorescent colourless (sometimes sporadically yellow) crystalline solid. It is a different isomer of 1-naphthol due to where the hydroxyl group is located on the naphthalene ring. The naphthols are more aggressive phenylene theme of identity of phenol. In simple beverages, amides, and chloroform, both isomers are liquid. A frequently utilized intermediary in the synthesis of dyes and other chemicals is 2-naphthol.

Explanation:

Difference between 1-naphthol and 2-naphthol:

There are structural isomers of alpha and beta naphthol.

The main distinction between alpha and beta naphthols is that the first carbon atom in alpha naphthol has a hydroxyl group next to the ring structure, whereas the second carbon atom in beta naphthol has a hydroxyl group away from the ring structure.

1-naphthol:

1. Containing the molecular formula C10H7OH, alpha naphthol is an organic material in which the carbon atom next to the surrounding ring system has a hydroxyl structure similar.
2. Comprises of 2 rings, with the first carbonyl group of one shield's hydroxyl group located next to the first carbon atom of the second ring.
3. Naphthalene is nitrated to produce one nitronaphthalene.
4. Utilized in the fast furfural test by Molisch. Both the Voges-Proskauer test and the Sakaguchi test are used as a base for various medications like nadolol or pesticides like carbonyl.

2-naphthol:

1. The second carbon atom from the nearby ring structure has a hydroxyl group connected to it, making beta naphthol a chemical molecule with the molecular formula CIOH7OH.
2. Comprises of 2 rings, with the second carbon atom from another ring's hydrogen bond on one of rings.
3. Naphthalene sulfonation in sulfuric acid, splitting of sodium hydroxide in liquid form, and neutralisation reactions.
4. a step in the synthesis process for dyes and other chemicals.

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