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Q.

Examine the following resonating structures of formic acid for their individual stability and then answer the question given below.

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Which of the following arrangements gives the correct order of decreasing stability of the above-mentioned resonance contributors?

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a

II > I > III > IV

b

I > II > III > IV

c

IV > III > I > II

d

IV > III > I > II

answer is B.

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Detailed Solution

I                                  >         II                                >              III                      >            IV

More covalent bond           More covalent bond          Less covalent bond                   Positive charge
complete octet neutral        complete octet                  incomplete octet                             on highly
                                                                                        (O>C                             electronegative     

                                                                                          stability                                   O-atom and negative charge on
                                                                                                                                       less electronegative C-atom                                                                                                                                         

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Examine the following resonating structures of formic acid for their individual stability and then answer the question given below.Which of the following arrangements gives the correct order of decreasing stability of the above-mentioned resonance contributors?