Question

Examine the following resonating structures of formic acid for their individual stability and then asnwer the question given below.
`H-overset(O)overset(||)underset(I)(C)-OHharrH-underset(II)overset(O^(-))overset(|)(C)=overset(+)(O)-HharrH-underset(III)overset(O^(-))overset(|)(C^(+))-OHharrH-underset(IV)overset(O^(+))overset(|)(C^(-))-OH`
Which of the following arrangements gives the correct order of decreasing stability of the above-mentioned resonance contributors ?
A. `IIgtIgtIIIgtIV`
B. `IgtIIgtIIIgtIgIV`
C. `IVgtIIIgtIgtII`
D. `IVgtIIIgtIgtII`

Answer 1

Correct Answer - B
`underset("complete octet neutral")underset("More covalent bond")(I) " " gt underset("complete octet")underset("More covalent bond")(II) "" gt underset("stability")underset((O^(1)gtC^(1)))underset("incomplete octet")underset("Less covalent bond")(III) " "gt underset("C-atom")underset("less electronegative")underset("O-atom and")underset("electronegative")underset("on highly")underset("Positive charge")(IV)`