## How many resonating structures are possible for tropylium cation?

Draw the seven resonance structures for the tropylium cation.

## How many resonating structures does Tropylium ion have?

seven resonance structures
Draw the seven resonance structures for the tropylium cation.

What is the structure of tropylium cation?

It is a regular heptagonal, planar, cyclic ion. It has 6 π-electrons (4n + 2, where n = 1), which fulfills Hückel’s rule of aromaticity. It can coordinate as a ligand to metal atoms. The structure shown is a composite of seven resonance contributors in which each carbon atom carries part of the positive charge.

### Why is Tropylium aromatic?

The cycloheptatrienyl anion has 8 electrons in its pi system. This makes it antiaromatic and highly unstable. The cycloheptatrienyl (tropylium) cation is aromatic because it also has 6 electronics in its pi system.

### What is the least stable resonating structure?

Thus, we can conclude that the least stable resonating structures among given options is structure (A) i.e., \$ C{H_2} = CH – \mathop C\limits^ + H – \mathop C\limits^ – H – N{H_2} \$ . Hence, option (A) is the correct answer.

Which is the most stable canonical structure?

bonds are more than 1st and 2nd, octet is complete, and positive charge is present on the most electronegative element which makes it highly unstable. effect is less than the 2nd part which makes cation less stable than the 1st part. So, “A” is the correct answer.

I > II > III.

## Which cation is aromatic in nature?

tropylium cation
Number of π electrons in the ring are 6, therefore, tropylium cation also follows Huckel’s Rule of (4n+2)π electrons, where n = 1. Thus, tropylium cation is satisfying all the conditions for aromaticity and consequently, aromatic in nature.

Why is Tropylium cation more stable?

The Tropylium cation also is as shown below, It attains the extra stability due to the conjugation of positive charges with the pi bonds. It has seven resonating structures. The more number of the resonating structure increases its stability concerning benzylic cation.

### Is 14 Annulene aromatic or not?

-Annulene is aromatic. character because it has a stable resonance structure V, which has an aromatic cation. 4. 8 π electrons make the anion anti-aromatic, so it is not stable though it has 7 resonance forms.

### Which is most stable carbocation?

tertiary carbocation
Correct answer: The carbocation bonded to three alkanes (tertiary carbocation) is the most stable, and thus the correct answer. Secondary carbocations will require more energy than tertiary, and primary carbocations will require the most energy.

How many resonance structures are there for tropylium?

The number of significant resonance structures for the tropylium cation is 7, the positive charge can be delocalized to each of the seven carbons as shown below. However 7 resonance structures can also be drawn for the tricyclopropylcarbinyl carbocation.

## How is the aromaticity of tropolone related to resonance?

The aromaticity of tropolone can be attributed to resonance involving the two nonequivalent VB structures 6 a and 6 b, and to several dipolar structures, such as 6 c and 6 d, in which the ring has the stable tropylium cation structure with six π electrons ( Section 21-9B ):

## How many electrons does a tropylium cation have?

It is a regular heptagonal, planar, cyclic ion. It has 6 π-electrons (4 n + 2, where n = 1), which fulfills Hückel’s rule of aromaticity. It can coordinate as a ligand to metal atoms. The structure shown is a composite of seven resonance contributors in which each carbon atom carries part of the positive charge.

How is tropylium used in mass spectrum analysis?

Mass spectrometry. The tropylium ion is frequently encountered in mass spectrometry in the form of a signal at m/z = 91 and is used in mass spectrum analysis. This fragment is often found for aromatic compounds containing a benzyl unit.