(1) Naphthalene reacts with concentrated sulfuric acid to form β-naphthalene sulfonic acid at high temperature. The reaction is intense and the temperature is not easy to control. There are side reactions. Polysulfonation and sulfones may be formed, which affect the purity of the product.

What happened when naphthalene is treated with Sulphuric acid at 165?

In industry naphthalene-monosulfonic acids are produced in a discontinuous process by reacting naphthalene batchwise with sulfuric acid, for the production of the α-acid at a temperature of up to about 50° C., for the preparation of the β-acid at a 160° to 165° C.

Is naphthalene soluble in sulfuric acid?

The concentration of sulfuric acid solution ranged from 0 to 80wt%,. The solubilities of 2-naphthalenesulfonic acid monohydrate and sodium 2-naphthalenesulfonate increased with temperature, and both of them were the lowest at 70wt%, of sulfuric acid solution(w ₃ ⁰ =0.70)while the highest in pure water.

Which of the following product is obtained when naphthalene is treated with concentrated h2 S o4 at 160 degree?

sulfuric acid produces the 1-sulfonic acid at 120 ºC and the 2-sulfonic acid at 160 ºC.

What are the products of nitration of naphthalene?

The two compounds formed by the nitration of naphthalene is an electrophilic aromatic substitution which gives two products namely: 1-nitronaphthalene and 2-nitronaphthalene.

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When naphthalene is nitrated under optimal condition which product is formed?

Naphthalene nitration can lead to two possible isomers, 1- and 2-nitronaphthalene. The former nitrocompound preferentially forms upon electrophilic processes and in the presence of nitrogen dioxide.

Why benzene is more aromatic than naphthalene?

Answer: So naphthalene is more reactive compared to single ringed benzene . Naphthalene has two aromatic rings, but only 10 pi electrons (rather than the twelve electrons that it would prefer). This means that naphthalene has less aromatic stability than two isolated benzene rings would have.

Does naphthalene react with sulfuric acid?

(1) Naphthalene reacts with concentrated sulfuric acid to form β-naphthalene sulfonic acid at high temperature. The reaction is intense and the temperature is not easy to control.

Why naphthalene is aromatic?

As we are getting a whole number from, 4nπ+2 formula for naphthalene, so naphthalene is aromatic. Therefore, the naphthalene is an aromatic compound according to Huckel's rule because it has 4nπ+2 delocalised electrons. Note: Pi bonds are known as delocalized bonds. Pi bonds cause the resonance.

Which of the following derivative is prepared for naphthalene?

Most naphthalene is derived from coal tar.

What dissolves naphthalene?

It is insoluble in water, somewhat soluble in ethanol, soluble in benzene, and very soluble in ether, chloroform, or carbon disulfide. Naphthalene is obtained from coal tar, a byproduct of the coking of coal.

Is naphthalene acidic or basic?

The three components of the mixture will react differently to sodium bicarbonate and sodium hydroxide because each of the bases' conjugate acids has a different pKa. The pKa's of benzoic acid and 2-naphthol are 4.17 and 9.5, respectively, while naphthalene is a neutral compound.

What color is naphthalene?

Physical / Chemical Properties:

Naphthalene is a white crystalline or colorless to brown solid. Naphthalene has a distinct aromatic odor.

How many resonance structures are there for naphthalene?

- Therefore, the number of possible resonating structures by naphthalene are two.

Is naphthalene a structure?

Structure of Naphthalene

Naphthalene is a member of a polynuclear aromatic hydrocarbon where two aromatic benzene rings are fused together at the ortho position. The bond length at the double bond position is around 1.36 Angstrom, and the bond length at the single bond position is around 1.40 angstrom.

Are salts of sulphonic acid *?

Detergents are soap-like compounds which are used for cleaning purpose. They are sodium salts of long chain alkyl benzene sulphonic acids or sodium salts of long chain alkyl hydrogen sulphate, whereas, soaps are sodium salts of long chain carboxylic acids.

Does naphthalene contain benzene?

naphthalene, the simplest of the fused or condensed ring hydrocarbon compounds composed of two benzene rings sharing two adjacent carbon atoms; chemical formula, C₁₀H₈.

Is naphthalene a ketone?

2-acetylnaphthalene is a naphthyl ketone that is naphthalene substituted at position 2 by an acetyl group.

Does naphthalene follow Huckel's rule?

-The naphthalene molecule is fully planner which means all the atoms are in the same plane. Thus, it is following the fourth criteria as well. Thus, a naphthalene molecule is following all the essential criteria of Huckel's rule. Hence, according to Huckel's rule of aromaticity, naphthalene is an aromatic compound.

When naphthalene is treated with conc sulfuric acid at 40 degree C following product is obtained?

Naphthalene reacts with concentrated sulfuric acid to yield naphthalenesulfonic acids. At temperature t₁, the product is naphthalene-1-sulfonic acid; at temperature t₂, the product is naphthalene-2-sulfonic acid.

What is the major product of Sulphonation of naphthalene?

why is naphthalene -2- sulphonic acid is the major product in sulphonation of napthelene at higher temperature in reaction ​

Is naphthalene unstable?

Both are aromatic in nature both have delocalised electrons but naphthalene has more number of π bonds and hence more resonance structures and more delocalisation so overall it must be more stable.

Is naphthalene electron donating?

Naphthalenes substituted with combinations of strongly electron-donating functional groups, such as alcohols and amines, and strongly electron-withdrawing groups, especially sulfonic acids, are intermediates in the preparation of many synthetic dyes.

What happens when naphthalene is reduced with sodium and alcohol?

Reduction of naphthalene and anthracene with sodium and tert-butyl alcohol gave 1,4-dihydronaphthalene and 9,10-dihydroanthracene respectively in high yields at room temperature (r.t.) as the sole products. The synthesis of tetralin from naphthalene was carried out in a one-pot reaction via 1,4-dihydronaphthalene.