Question

Circle the stronger BASE in each pair. No explanation, no incomplete answers. I have 4 of these correct so I will know if you’re getting them wrong.

3. Circle the stronger base in each pair. (0.2 pts ea = 2.0 pts) a. (CH3) 3COK vs. CH3OK b. HCECNa vs. CH3CH2ONa C. NaNH2 vs. HCECNa d. NacN vs. NaI e. NaHCO3 vs. NaOH f. NaOH vs. CoH5CO2Na g. C6H5COzNa vs. CoH5ONa h. CH3CO2Na vs. CH3ONa i. CH3ONa vs. NaH j. NH3 vs. CH3CO2Na

Answer 1

Sol :-

(a). (CH₃)₃COK is stronger base than CH₃COK, because in (CH₃)₃COK has three electron donating groups that is +I -CH₃ groups which increase the electron density on oxygen atom and make it a strong base. While CH₃COK only contains one -CH₃ group.

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(b). HC≡CNa is stronger base than CH₃CH₂ONa, because in HC≡CH is weaker acid than ethanol C₂H₅OH, therefore its conjugate base HC≡C^- must be stronger base than conjugate base C₂H₅O^- of C₂H₅OH.

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(c). NaNH₂ is stronger base than HC≡CNa, because in NH₃ is weaker acid than HC≡CH, therefore its conjugate base NH₂^- must be stronger base than conjugate base HC≡C^- of HC≡CH.

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(d). NaCN is stronger base than NaI, because in HCN is weaker acid than HI, therefore its conjugate base CN^- must be stronger base than conjugate base I^- of HI.

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(e). NaOH is stronger base than NaHCO₃, because in NaHCO₃ is the salt of strong base NaOH and weak acid H₂CO₃. On the other hand NaOH is the stronger base.

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(f). NaOH is stronger base than C₆H₅COONa, because in C₆H₅COONa is the salt of strong base NaOH and weak acid C₆H₅​​​​​​​COOH. On the other hand NaOH is the stronger base.

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(g). C₆H₅ONa​​​​​​​ is stronger base than C₆H₅COONa, because in C₆H₅OH is weaker acid than C₆H₅​​​​​​​COOH, therefore its conjugate base C₆H₅O^- must be stronger base than conjugate base C₆H₅​​​​​​​COO^- of C₆H₅​​​​​​​COOH.

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(h). CH₃ONa​​​​​​​ is stronger base than CH₃COONa, because in CH₃OH is weaker acid than CH₃COOH, therefore its conjugate base CH₃O^- must be stronger base than conjugate base CH₃COO^- of CH₃COOH.

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(i). NaH​​​​​​​ is stronger base than CH₃ONa, because NaH gives strong base NaOH when dissolve in water.

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(j). NH₃ is stronger base than CH₃COONa. Because nitrogen in NH₃​​​​​​​ good electron donar than oxygen in CH₃COONa.