The correct order of increasing basicity of the given conjugate bases…

The correct order of increasing basicity of the given conjugate bases $\left(\mathrm{R}=\mathrm{CH}_3\right)$ is
  1. $\mathrm{RCO} \overline{\mathrm{O}} < \mathrm{HC}=\overline{\mathrm{C}} < \overline{\mathrm{R}} < \overline{\mathrm{N}} \mathrm{H}_2$
  2. $\overline{\mathrm{R}} < \mathrm{HC} \equiv \overline{\mathrm{C}} < \mathrm{RCO} \overline{\mathrm{O}} < \overline{\mathrm{N}} \mathrm{H}_2$
  3. $\mathrm{RCO} \overline{\mathrm{O}} < \overline{\mathrm{N}} \mathrm{H}_2 < \mathrm{HC} \equiv \overline{\mathrm{C}} < \overline{\mathrm{R}}$
  4. $\mathrm{RCO} \overline{\mathrm{O}} < \mathrm{HC} \equiv \overline{\mathrm{C}} < \overline{\mathrm{N}} \mathrm{H}_2 < \overline{\mathrm{R}}$

Solution

Correct order of increasing basic strength is $ \mathrm{R}-\mathrm{COO}^{(-)} < \mathrm{CH} \equiv \mathrm{C}^{(-)} < \mathrm{NH}_2^{(-)} < \mathrm{R}^{(-)} $

Asked in: JEE Main 2010

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