Question

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Answer 1

Answer:

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The octet of all the atom are complete in the structure (a) and (b). The molecule in which all the atoms have complete octet is more stable than the molecules in which atom have incomplete octet. larger the number of resonating structures, larger will be the stability, thus structure (a) and (b) are stable.

In structure (d), the electron deficiency of positive charged carbon is duly compensate by one pair of electrons of adjacent oxygen atoms while such neighbour group support is not available in structure (c). hence structure (c) is least stable in comparison to structure (d).

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