why ethyne does not react with NaOH?
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Acetylene has an acidic nature. It means it has an acidic tendency or it can loose proton if provided a suitable reagent (highly basic). It is not a strong acid to react with weak base like Na2CO3. Even NaOH or KOH also does not react. Only Bases like NaNH2 (sodamide) or Tollens reagent and a few other are able to replace H+ of acetylene by the metal atom.
H-CC-H + NaNH2 --------------> H-CC-Na + NH3
H-CC-H + Ag+ (Tollen's reagent) -------------------> H-CC-Ag + H+
In acetylene carbon is sp hybridized. The bond length sp<sp2<sp3. So sp bond is smallest the bonded pair in case of sp hybridized bond is nearer to C than in cases of sp2 snd sp3 bonds. So sp hybridized cabon is more electronegetive and can pull electron more nearer to the carbon and make hydrogen od actylene acquire a little positive charge. Thus the hydrogen become a little acidic in nature but not like hydrogen of an regular acid like CH3COOH and even much less than C2H5OH.. thnk u
H-CC-H + NaNH2 --------------> H-CC-Na + NH3
H-CC-H + Ag+ (Tollen's reagent) -------------------> H-CC-Ag + H+
In acetylene carbon is sp hybridized. The bond length sp<sp2<sp3. So sp bond is smallest the bonded pair in case of sp hybridized bond is nearer to C than in cases of sp2 snd sp3 bonds. So sp hybridized cabon is more electronegetive and can pull electron more nearer to the carbon and make hydrogen od actylene acquire a little positive charge. Thus the hydrogen become a little acidic in nature but not like hydrogen of an regular acid like CH3COOH and even much less than C2H5OH.. thnk u
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