The increasing order of the electron-withdrawing power of the following functional groups is:
a. $-CN$
b. $-COOH$
c. $-NO_2$
d. $-I$

  • A
    $c < b < d < a$
  • B
    $c < a < b < d$
  • C
    $d < b < a < c$
  • D
    $a < b < c < d$

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