Which the resonance structure of the following species : (i) :overset(-)CH_(2)-C-=N: (ii) CH_(3)CH=CH-overset(+)CH-CH_(3) (iii) overset(+)CH_(2)-CH=CH-overset(-)CH_(2) (iv) CH_(3)-overset( :O: )overset(||)C-overset(-)underset(..)CH_(2) (B) Write resonance structure for the intermediate carbocation in the aromatic chlorination of benzene. (C) Write the main resonance structure of the conjugate base of a 1, 3-diketone. (D) Write the resonance structure of CH_(2)=CH-CHO. Indicate relative stability of the contributing structures.

Which the resonance structure of the following species : (i) :overset

1.	Which the resonance structure of the following species : (i) :overset(-)CH_(2)-C-=N: (ii) CH_(3)CH=CH-overset(+)CH-CH_(3) (iii) overset(+)CH_(2)-CH=CH-overset(-)CH_(2) (iv) CH_(3)-overset( :O: )overset(\|\|)C-overset(-)underset(..)CH_(2) (B) Write resonance structure for the intermediate carbocation in the aromatic chlorination of benzene. (C) Write the main resonance structure of the conjugate base of a 1, 3-diketone. (D) Write the resonance structure of CH_(2)=CH-CHO. Indicate relative stability of the contributing structures.
Answer» SOLUTION : Structure I: More stable, because it has more number of covalent bonds and have no formal charge. Each carbon and oxygen atom has an octet. Structure II: Less stable, because it has negative charge on more ELECTRONEGATIVE atom and positive charge on more electropositive atom. Structure III: LEAST stable, because it does not contribute as oxygen has positive charge and carbon has negative charge.