Which resonance form in each of the following sets is the major contributor to the real structure? (i) underset((A))(CH_(2)-underset(CH_(3))underset(|)(C)-CH)=CH_(2)harrunderset((B))(overset(+)(CH_(2))-underset(CH_(3))underset(|)(C)=CH)-overset(-)(CH_(2)) harr underset((C))(overset(-)(CH_(2))-underset(CH_(3))underset(|)(C)=CH)-overset(+)CH_(2) (ii) underset((A))(CH_(3)-overset(O)overset(||)(C)-CH)=CH_(2)harrunderset((B))(CH_(3)-overset(O^(-))overset(|)underset(+)(C)-CH)=CH_(2)harr underset((C))(CH_(3)-overset(O^(-))overset(|)(C)=CH)-overset(+)(CH_(2)) (iii) underset((A))(CH_(2)=CH-CH=CH_(2))harrunderset((B))(overset(+)(C)H_(2)-CH=CH)-overset(-)CH_(2)harrunderset((C))(overset(-)(CH_(2))-CH=CH-overset(+)(CH_(2))

Which resonance form in each of the following sets is the major contri

1.	Which resonance form in each of the following sets is the major contributor to the real structure? (i) underset((A))(CH_(2)-underset(CH_(3))underset(\|)(C)-CH)=CH_(2)harrunderset((B))(overset(+)(CH_(2))-underset(CH_(3))underset(\|)(C)=CH)-overset(-)(CH_(2)) harr underset((C))(overset(-)(CH_(2))-underset(CH_(3))underset(\|)(C)=CH)-overset(+)CH_(2) (ii) underset((A))(CH_(3)-overset(O)overset(\|\|)(C)-CH)=CH_(2)harrunderset((B))(CH_(3)-overset(O^(-))overset(\|)underset(+)(C)-CH)=CH_(2)harr underset((C))(CH_(3)-overset(O^(-))overset(\|)(C)=CH)-overset(+)(CH_(2)) (iii) underset((A))(CH_(2)=CH-CH=CH_(2))harrunderset((B))(overset(+)(C)H_(2)-CH=CH)-overset(-)CH_(2)harrunderset((C))(overset(-)(CH_(2))-CH=CH-overset(+)(CH_(2))
Answer» Answer :FORM A in (i), (ii), (iii) and form C in (IV) is the major contributor because in these STRUCTURES each atom has OCTET and no formal charge is present.