KCET · Chemistry · General Organic Chemistry
Which of the following is the strongest base?
- A \(\mathrm{CH}_{3} \mathrm{COO}^{-}\)
- B \(\mathrm{Cl}^{-}\)
- C \(\mathrm{OH}^{-}\)
- D \(\mathrm{CH}_{3} \mathrm{O}^{-}\)
Answer & Solution
Correct Answer
(D) \(\mathrm{CH}_{3} \mathrm{O}^{-}\)
Step-by-step Solution
Detailed explanation
We know, an anion is strongest base, if its conjugate acid is weakest.
Here, \(\mathrm{CH}_{3} \mathrm{COO}^{-}\)will have conjugate acid \(\mathrm{CH}_{3} \mathrm{COOH}\).
\(\mathrm{Cl}^{-}\)will have conjugate acid HCl.
\(\mathrm{OH}^{-}\)will have conjugate acid HOH. \(\mathrm{CH}_{3} \mathrm{O}^{-}\)will have conjugate acid \(\mathrm{CH}_{3} \mathrm{OH}\).
Since, out of above four, \(\mathrm{CH}_{3} \mathrm{OH}\) will be the weakest acid and hence, \(\mathrm{CH}_{3} \mathrm{O}^{-}\)will be strongest base.
Here, \(\mathrm{CH}_{3} \mathrm{COO}^{-}\)will have conjugate acid \(\mathrm{CH}_{3} \mathrm{COOH}\).
\(\mathrm{Cl}^{-}\)will have conjugate acid HCl.
\(\mathrm{OH}^{-}\)will have conjugate acid HOH. \(\mathrm{CH}_{3} \mathrm{O}^{-}\)will have conjugate acid \(\mathrm{CH}_{3} \mathrm{OH}\).
Since, out of above four, \(\mathrm{CH}_{3} \mathrm{OH}\) will be the weakest acid and hence, \(\mathrm{CH}_{3} \mathrm{O}^{-}\)will be strongest base.
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