In the polar aprotic solvent, the increasing order of nucleophilicity of the following is:

${H O}^{-}, {H S}^{-}, {H S e}^{-}$

{H O}^{-} < {H S e}^{-} < {H S}^{-}

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{H O}^{-} = {H S}^{-} = {H S e}^{-}

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{H O}^{-} < {H S}^{-} < {H S e}^{-}

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{H O}^{-} > {H S}^{-} < {H S e}^{-}

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Solution

The correct option is B ${H O}^{-} < {H S}^{-} < {H S e}^{-}$
In the polar aprotic solvent, the increasing order of nucleophilicity is ${H O}^{-} < {H S}^{-} < {H S e}^{-}$ .
The decreasing order of electronegativity is $O > S > S e$ . In the hydroxide ion, the negative charge is present on more electronegative O atom as compared to Se atom in hydroselenide ion. Hence, the negative charge can be less readily donated by hydroxide ion than by hydroselenide ion.

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Similar questions

Q. Classify the following reactions in one of the reaction types studied.
a.

C H_{3} C H_{2} B r + H S^{⊖} \to C H_{3} C H_{2} S H + B r^{⊖}

{(C H_{3})}_{2} C = C H_{2} + H C l \to {(C H_{3})}_{2} (C l) C - C H_{3}

{(C H_{3})}_{3} C - C H_{2} O H + H B r \to {(C H_{3})}_{2} C (B r) C H_{2} C H_{3}

C H_{3} C H_{2} B r + H O^{⊖} \to C H_{2} = C H_{2}

Q. Identify the nucleophilicity order in the following

H O^{⊖}

{C H}_{3} C O O^{⊖}

in protic solvent:

Classify the following reactions in one of the reaction type studied in this unit.
(a) $C H_{3} C H_{2} B r + H S^{-} \to C H_{3} C H_{2} S H + B r^{-}$
(b) $(C H_{3})_{2} C = C H_{2} + H C l \to (C H_{3})_{2} C l C - C H_{3}$
(c) $C H_{3} C H_{2} B r + H O^{-} \to C H_{2} = C H_{2} + H_{2} O + B r^{-}$
(d) $(C H_{3})_{3} C - C H_{2} O H + H B r \to (C H_{3})_{2} C B r C H_{2} C H_{3} + H_{2} O$

Q. The decreasing order of relative nucleophilicity of the following nucleophiles in a protic solvent is

S H^{-}, A c O^{-}, P h O^{-}, O H^{-}, H_{2} O

The structure of D-(+)-mannose is:

The structure of L-(–)-mannose is:

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In the polar aprotic solvent, the increasing order of nucleophilicity of the following is: HO−, HS−, HSe−

In the polar aprotic solvent, the increasing order of nucleophilicity of the following is:

${H O}^{-}, {H S}^{-}, {H S e}^{-}$