Examine the following two structures for the anilinium ion and choose correct statement from the ones given below: 

                       

 

How many of the following are heterocyclic aromatic compounds? 

Benzene, cyclopentadiene, oxirane, tetrahydrofuran, naphthalene, cyclopentane, tropolone, azulene, diphenyl. 

How many of the following cannot show tautomerism? 

Acetophenone, acetaldehyde, cyclohexanone, acetylacetone, benzoquinone, acetone, benzaldehyde, butanone, ethyl acetoacetate. 

Amongst the following the total number of electrophiles is :

${\mathrm{CN}}^{-}, {\mathrm{H}}^{+}, {{\mathrm{NO}}_2}^{+}, {\mathrm{Cl}}^{+},{\mathrm{OH}}^{-}, {\mathrm{H}}_3{\mathrm{O}}^{+}, :{\mathrm{CH}}_2, :{\mathrm{NH}}_3, {\mathrm{Na}}^{+}$