Aromatic Compounds

Q.

Is pyridine an aromatic compound?

Q.

The staggered form of ethane has

Q. 21.What is the difference between a non-benzenoid cyclic compound and a heterocyclic aromatic compound?

Q. Choose the correct statement(s) with respect to the given molecule

1. It is bicyclic planar molecule
2. It is non planar molecule
3. It is non-aromatic compound
4. It is antiaromatic compound

Q. Ordinarily the barrier to rotation about a carbon-carbon double bond is quite high but in compound P double bond between two rings was observed by NMR to have a rotational energy barrier of only about 20 cal/mol, showing that it has lot of single bond character.
The reason for this is

1. Double bond having partial triple bond character because of resonance
2. Double bond undergo flipping
3. Double bond is having high single bond character because of aromaticity gained in both three and five membered rings.
4. +I effect of $n{C}_3{H}_7$ groups makes double bond having partial single bond character.

Q.

Which of the following statement is correct?

1. Two tautomers have different functional groups.

2. Tautomerism may occur in planar or non planar molecules.

3. Tautomerism is possible in benzaldehyde (C₆H₅CHO).

4. Tautomerism is not possible in benzophenone (C₆H₅COC₆H₅).

Q. Choose the correct statement for the following compounds :

1. (a) is anti-aromatic.
2. (b) is anti-aromatic.
3. (b) is aromatic.
4. (a) is aromatic.

Q.

The most contributing tautomeric enol form of $MeCOC{H}_{2}C{O}_{2}Et$ is:

1. H₂C=C(OH)CH₂CO₂Et

2. MeC(OH) = CHCO₂Et

3. 2-Pentanone

4. 2-Butene

Q. Which of the following is not an aromatic compound?

1. 
2. 
3. 
4. 

Q. Here, given compound is:

1. Aromatic
2. Non-aromatic
3. Anti-aromatic
4. None of these

Q. The following species is :

1. Aromatic
2. Anti-aromatic
3. Non-aromatic
4. none of these

Q.

Which of the following is a tautomer of

$C{H}_3-\underset{\stackrel{||}{O}}{C}-H$?

1. 

2. 

3. CH₃-CH₂-CHO

4. CH₃-COOH

Q. Which of the following compound is aromatic?

1. 
2. 
3. 
4. 

Q. Which of the following compound is non aromatic:

1. 
2. 
3. 
4. 

Q. Which of the following compound is non aromatic:

1. 
2. 
3. 
4. 

Q. Aromatic compounds:

1. Contain (4n + 4) $\pi$-electrons
2. contain (4n + 2) $\pi$-electrons
3. $C_n{H}_{2n-2}$ general formula
4. Highly reactive

Q.

Which of the following are aromatic?

1. 

2. 

3. 

4. 

Q. Arrange the following alcohols in decreasing order of the ease of ionization under acidic conditions.

1. I > III > II
2. I > II > III
3. II > III > I
4. II > I > III

Q. What kind of aromatic compound is this?

1. Benzenoid
2. Non-benzenoid
3. Homocyclic
4. Heterocyclic

Q.

Which of the following have $\alpha$-Hydrogen ?

1. C₆H₅COC₆H₅

2. C₆H₅CHO

3. 

4. (CH₃)₃C-CHO

Q. Which of the following compound(s) are stable in their ionic structure?

1. 
2. 
3. 
4. 

Q. Is 1, 3, 5 trihydroxybenzene a aromatic compound or not

Q. The number of π electrons present in the benzene ring is .

1. 3
2. 6
3. 2

Q. The number of π electrons present in the benzene ring is .

1. 3
2. 6
3. 2

Q.

According to Huckel's rule, the number of π electrons to be taken while determining aromaticity in case of

.

1. 6
2. 8
3. 4
4. 5

Q. Which of the following statement(s) is correct regarding quasi-aromatic compounds?

1. Have high dipole moment
2. Have high melting point and boiling point
3. Crystalline in nature.
4. All of the above.

Q.

1. True

2. False