When the sulfonation of naphthalene is carried out at 80 OC product will form?

When the reaction is run at 80 ^oC, 1-naphthalenesulfonic acid is the major product; at 160 ^oC, 2-naphthalenesulfonic acid is the major product. The intermediates in the sulfonation are arenium ions.

Which of the following product is obtained when naphthalene is treated with conc h2so4 at 80?

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

What is the product when Sulphonation of naphthalene in 165c?

Naphthalene reacts with sulphuric acid at 165°C to yield 2-Naphthalene sulfonic acid. Naphthalene is an aromatic compound with molecular formula, . Naphthalene on sulfonation, can form two products, 1-naphthalene sulphonic acid, and 2-naphthalene sulphonic acid.

Why Sulphonation of naphthalene yields different products at low and high temperatures?

That's because the products of sulfonation of napthalene have different control mechanisms. In other words, Napthalene-1-sulfonic acid is a kinetically controlled product (KCP) while Napthalene2-sulfonic acid is a thermodynamically controlled product (TCP).

Which is the stable product in Sulphonation of naphthalene *?

(2) Naphthalene sulfonation is a reversible reaction, its products are related to external conditions. The main product is α-naphthalene sulfonic acid at low temperature (35-90℃ ), and the same reaction mixture mainly produces β-naphthalene sulfonic acid at high temperature (160-165℃ ).

Sulphonation reaction of Naphthalene

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.

Why naphthalene undergo sulfonation reaction preferentially at beta position?

Naphthalene undergoes sulphonation at beta position at higher temperature. Beta derivative requires higher activation energy as compared to alpha derivative but once beta derivative formed , is thermodynamically more stable than alpha derivative.

Why does naphthalene undergo electrophilic substitution reaction at alpha position?

question. Electrophilic substitution reaction in naphthalene is quite similar to benzene reaction. The alpha position is more stabilized than the beta position. The carbocation formed at an alpha position after the attack of an electrophile is much more stabilized by its resonance than the second position.

Is Sulphonation electrophilic substitution?

Nitration and sulfonation of benzene are two examples of electrophilic aromatic substitution.

How many resonance structures are there for naphthalene?

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

What will be the product formed when phenol react with Br2 in ccl4 medium?

The products formed in the reaction of phenol with Br2 dissolved in CS2 at 0oC are o-bromophenol and p-bromophenol.

How is Sulphonation of benzene carried discuss mechanism?

The mechanism for Sulfonation of benzene

Due to higher electronegativity, oxygen present in sulphuric acid pulls an electron towards itself, generating an electrophile. This attacks the benzene ring, leading to the formation of benzenesulfonic acid.

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.

Which is the most preferred position for electrophilic substitution reaction in naphthalene?

Note: Naphthalene can undergo electrophilic aromatic substitution (EAS) reactions similar to benzene and generally prefers to substitute at the alpha position.

What is the proof for the presence of two fused rings in naphthalene?

Naphthalene contain 10 π electrons. So, according to Hückel's Rule (n=2) naphthalene obeys (4n+2)π electron rule.

When anthracene is treated with sodium dichromate and Sulphuric acid It gives?

SODIUM DICHROMATE OXIDISES ANTHRACENE TO ANTHRAQUINONE.

What is the electrophile in sulfonation?

Sulfur trioxide is an electrophile because it is a highly polar molecule with a fair amount of positive charge on the sulfur atom. It is this which is attracted to the ring electrons.

What reagent is sulfonation?

Sulfonation with oleum and sulfuric acid

Oleum and sulfuric acid are widely used sulfonation and sulfation reagents, although reactions with these reagents require corrosion-resistant materials of construction.

Which is the electrophile in sulphonation reaction How is it generated?

Sulphonation of benzene is a reversible reaction. -The mixture of sulphur trioxide and sulphuric acid is known as fuming sulphuric acid. We know that oxygen has high electronegativity. Thus, oxygen in sulphuric acid pulls an electron toward itself and generates an electrophile ${\text{S}}{{\text{O}}_{\text{3}}}$.

What is alpha and beta position in naphthalene series?

Thus there are two sets of equivalent hydrogen atoms: the alpha positions, numbered 1, 4, 5, and 8, and the beta positions, 2, 3, 6, and 7.

Why the 1st position of naphthalene is more reactive than 2nd position explain giving mechanism?

Substitution usually occurs more readily at the 1 position than at the 2 position because the intermediate for 1-substitution is more stable than that for 2-substitution. The reason is that the most favorable resonance structures for either intermediate are those that have one fully aromatic ring.

How is naphthalene synthesized?

It can be synthesized by Haworth synthesis, the steps are as follows: The Friedel craft acylation reaction of benzene with succinic anhydride gives 3 benzoylpropionic acid. The second step is Clemmenson's reaction with 3-benzoylpropionic acid which gives 4-phenylebutanoic acid.

Does naphthalene undergo addition reactions?

Naphthalene also undergoes addition reactions more readily than benzene. It is reduced by sodium and amyl alcohol to tetra-hydronaphthalene, whereas benzene is unattacked by the reagent. The product tetralin is also obtained by the partial catalytic hydrogenation of naphthalene.

Is Naphthalene a liquid?

Naphthalene (NAF-thuh-leen) is a white crystalline volatile solid with a characteristic odor often associated with mothballs. The compound sublimes (turns from a solid to a gas) slowly at room temperature, producing a vapor that is highly combustible.