1. Tardigrade
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  3. Chemistry
  4. The correct stability order for the following species is

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Q. The correct stability order for the following species isChemistry Question Image

IIT JEEIIT JEE 2008Organic Chemistry – Some Basic Principles and Techniques

Solution:

The $\sigma$-electron of $C - H$ bond is delocalised with $p$-orbitals of $\pi$-bond.
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Therefore, overall stability order is :$ I > III > II > IV$