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The decreasing order of strength of the bases,

OH-, N${\mathrm{H}}_{2}^{-}$, H-C$\equiv$C- and CH3-C${\mathrm{H}}_{2}^{-}$ is:

(a) CH3-C${\mathrm{H}}_{2}^{-}$>N${\mathrm{H}}_{2}^{-}$> H-C$\equiv$C->OH-

(b) H-C$\equiv$C-> CH3-C${\mathrm{H}}_{2}^{-}$>N${\mathrm{H}}_{2}^{-}$>OH-

(c) OH->N${\mathrm{H}}_{2}^{-}$>H-C$\equiv$C->CH3-C${\mathrm{H}}_{2}^{-}$

(d) N${\mathrm{H}}_{2}^{-}$>H-C$\equiv$C->OH->CH3-C${\mathrm{H}}_{2}^{-}$