What is the decreasing order of basic strength for the following ions: $OH^-$,$NH_2^-$,$HC \equiv C^-$,and $CH_3CH_2^-$?

  • A
    $CH_3CH_2^- > NH_2^- > HC \equiv C^- > OH^-$
  • B
    $HC \equiv C^- > CH_3CH_2^- > NH_2^- > OH^-$
  • C
    $OH^- > NH_2^- > HC \equiv C^- > CH_3CH_2^-$
  • D
    $NH_2^- > HC \equiv C^- > OH^- > CH_3CH_2^-$

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