1. Tardigrade
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  3. Chemistry
  4. The correct order of decreasing length of the bond as indicated by the arrow in the following structure is

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Q. The correct order of decreasing length of the bond as indicated by the arrow in the following structure isChemistry Question Image

WBJEEWBJEE 2014

Solution:

The length of carbon-carbon single bond is always greater than that of the carbon-carbon double bond.
In III, positive charge is not in conjugation of double bond, so the bond does not acquire a double bond character. However, chances of acquiring double bond character (of the indicated bond) is much more in I than that in case of II.
Thus, the correct order of decreasing bond length is
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