SATHEE: Equilibrium Question 887

Equilibrium Question 887

Question: Which of the following statements is not correc'

Options:

A) $I^{-}$ is a weaker base than $F^{-}$

B) $H O^{-}$ is a stronger base than $H_{2} N^{-}$

C) $H O N H_{2}$ is a weaker base than $N H_{3}$

D) $F_{3} C^{-}$ is a stronger base than $C l_{3} C^{-}$

Show Answer

Answer:

Correct Answer: C

Solution:

[a] For elements in the same periodic group, the larger the basic site atom the more spread out (delocalized) is the charge and the weaker is the base. Thus $l^{-}$ is a weaker base than $F^{-}$ . Alternatively, HI is stronger acid than HF, the conjugate base follows the reverse order. [b] $H_{2} O$ is a stronger acid than $N H_{3},$ thus the conjugate base $O H^{-}$ is weaker base than $N H_{2}^{-}$

[c] Electron - attracting inductive effect of $-, O H$ decreases the electron density on N and thus decreases the basicity of $- N H_{2}^{} .$

[d] In $C l_{3} C^{-},$ the unshared electron pair of the carbon in the p-orbital undergoes extended $p - d π$ bonding into an emtpy d-orbital of each of the three Cl atoms. $[\underset{∙ ∙}{\overset{∙ ∙}{: C l}}, - \underset{\begin{matrix} | \\ \underset{∙ ∙}{\overset{}{: C l}}, : \end{matrix}}{C}, = \underset{∙ ∙}{\overset{∙ ∙}{C l}}, : {r i g h t a r r o w}^{-} \underset{∙ ∙}{\overset{∙ ∙}{: C l}}, = \underset{\begin{matrix} | \\ \underset{∙ ∙}{\overset{}{: C l}}, : \end{matrix}}{C}, -^{-} \underset{∙ ∙}{\overset{∙ ∙}{C l}}, : r i g h t a r r o w \underset{∙ ∙}{\overset{∙ ∙}{: C l}}, - \underset{\begin{matrix} | \\ \underset{∙ ∙}{\overset{}{: C l}}, : - \end{matrix}}{C}, - \underset{∙ ∙}{\overset{∙ ∙}{C l}}, :]$

Resonance stabilization makes a more dominating role than the inductive effect, making $C l_{3} C^{-}$ a weaker base than $F_{3} C^{-} .$

In F, there is no d orbitals, hence, no stabilization occurs in $F_{3} C^{-} .$

Equilibrium Question 887

Question: Which of the following statements is not correc'

Options:

Answer:

Solution:

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Equilibrium Question 887

Question: Which of the following statements is not correc'

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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