Huckel's Rule of Aromaticity

Q. Which of the following are benzenoid compounds?

1. 
2. 
3. 
4. 

Q.

Can aromatic compounds be heterocyclic?

1. True

2. False

Q. Select the correct option(s) where aromatic product is/are formed.

1. 
2. 
3. 
4. 

Q.
The given compound is:

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

Q. In Huckel's (4n + 2) $\pi e^{-}$ rule for aromaticity, 'n' represents?

1. Number of carbon atoms
2. Number of rings
3. Fractional number (or) integer (or) zero
4. Whole number

Q. The necessary condition for the aromatic ring is that it should have ....... $\pi -$electrons.

1. (4 + 2)n
2. (4n + 2)
3. (3 + 4n)
4. (4n)

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

The reason for this is:

1. The double bond has a partial triple bond character due to resonance
2. The double bond undergoes flipping
3. The aromaticity attained by both the three membered and the five membered rings
4. The $+I$ effect exhibited by the $n{C}_3{H}_7$ groups induces the double bond to have a partial single bond character

Q. Which of these is anti-aromatic in nature?

1. 
2. 
3. 
4. 

Q. The following species is :

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

Q. Which of the following compound is not aromatic?

1. 
2. 
3. 
4. 

Q. If the number of aromatic compounds in the given set of compounds is X, and the number of non-aromatic compounds in the same set is Y, then, X+Y is: .