1. Tardigrade
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  3. Chemistry
  4. Decreasing order of -I power of given groups is: (a) CN (b) NO 2 (c) stackrel+ NH 3 (d) F

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Q. Decreasing order of $ -I $ power of given groups is:
(a) $CN$
(b) $NO _{2}$
(c) $\stackrel{+}{ NH _{3}}$
(d) $F$

Organic Chemistry – Some Basic Principles and Techniques

Solution:

$NH _{3}^{+}$ is most stronger electron withdrawing since it is electron deficient and carrying a positive charge. Nitro group is also an electron withdrawing group. $CN -$ is more withdrawing group than $F -$ because fluorine being smaller in size, is already carrying a negative charge and cannot withdraw any more electrons.