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Chemistry Question on reaction mechanism

What is the decreasing order of strength of the bases? OH−,NH2−,H−C≡C− and CH3−CH2−OH^{-},NH_2^-,H-C \equiv C^- \, and \, CH_3-CH_2^-

A

CH3−CH2−>NH2−>H−C≡C−>OH−CH_3-CH_2^- > NH_2^- > H-C \equiv C^- > OH^-

B

H−C≡C−>CH3−CH2−>NH2−>OH−H-C \equiv C^-> CH_3-CH_2^- > NH_2^- > OH^-

C

OH−>NH2−>H−C≡C−>CH3−CH2−OH^- > NH_2^- > H-C \equiv C^- > CH_3-CH_2^-

D

NH2−>H−C≡C−>OH−>CH3−CH2−NH^-_2 > H -C \equiv C^- > OH^- > CH_3-CH_2^-

Answer

CH3−CH2−>NH2−>H−C≡C−>OH−CH_3-CH_2^- > NH_2^- > H-C \equiv C^- > OH^-

Explanation

Solution

CH3CH2−>NH2−>H−C≡C−>HO−CH_3CH_2^- > NH_2^- > H-C \equiv C^- > HO^- It is because the order of acid-strength of their conjugate acid is CH3CH3<NH3<H−C≡C−H<H2O:CH_3CH_3 < NH_3 < H-C \equiv C-H < H_2O: Acid strength.