First slide

Boronsted-Lowry theory

Question

What is the decreasing order of strength of the bases ${OH}^{-}, {NH}_{2}^{-}, H - C \equiv C^{-} and {CH}_{3} - {CH}_{2}^{-} ?$

Moderate

A

${CH}_{3} - {CH}_{2}^{-} > {NH}_{2}^{-} > H - C \equiv C^{-} > {OH}^{-}$
B

$H - C \equiv C^{-} > {CH}_{3} - {CH}_{2}^{-} > {NH}_{2}^{-} > {OH}^{-}$
C

${OH}^{-} > {NH}_{2}^{-} > H - C \equiv C^{-} > {CH}_{3} - {CH}_{2}^{-}$
D

${NH}_{2}^{-} > H - C \equiv C^{-} > {OH}^{-} > {CH}_{3} - {CH}_{2}^{-}$

Solution

Their conjugate acids are $H - OH, {NH}_{3}$ , $H - C \equiv C - H and {CH}_{3} - {CH}_{3}$ Their acidic character are $H - OH > CH \equiv CH > {NH}_{3} > {CH}_{3} - {CH}_{3}$ . A strong acid has a weak conjugate base. Hence, the strengths of bases will be
${CH}_{3} - {CH}_{2}^{-} > {NH}_{2}^{-} > H - C \equiv C^{-} > {OH}^{-}$

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