Incorrect statement regarding aromaticity is-

1. Compound should have a planar structure.

2. The π–electrons of the compound are completely delocalized in the ring.

3. The total number of π–electrons present in the ring should be equal to (4n + 2) $\mathrm{\pi } \mathrm{electron}$, where n = 0, 1, 2 … etc. This is known as Huckel’s rule. 

4. Compound should have a linear structure

Not an aromatic molecule is/are -

1. 

2.  

3. 

4.  All of the above

Incorrect statement towards reactivity of benzene is

1. It undergoes electrophilic substitution reactions very easily

2. Nucleophiles are attracted by a benzene ring

3. Benzene is a planar molecule 

4. It has 12 sigma bonds

Benzene is extraordinarily stable, though it contains three double bonds, because of -

1. Delocalized protons

2. Delocalized neutrons

3. Resonance

4. None of these

The numbers of structural isomers of ${\mathrm{C}}_4{\mathrm{H}}_8$ (one double bond) and ${\mathrm{C}}_5{\mathrm{H}}_8$ (one triple bond) are -

1. ${\mathrm{C}}_4{\mathrm{H}}_8 = 3 ; {\mathrm{C}}_5{\mathrm{H}}_8 = 3$

2. ${\mathrm{C}}_4{\mathrm{H}}_8 = 4 ; {\mathrm{C}}_5{\mathrm{H}}_8 = 4$

3. ${\text{C}}_4{\mathrm{H}}_8 = 3 ; {\mathrm{C}}_5{\mathrm{H}}_8 = 4$

4.${\mathrm{C}}_4{\mathrm{H}}_8 = 4 ; {\mathrm{C}}_5{\mathrm{H}}_8 = 3$