Which of the following species cannot act as an electron pair donor for the formation of dative bond?

_{3}

^{+}

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_{4}^{+}

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^{-}

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_{3}

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Solution

The correct option is C NH $_{4}^{+}$
In a dative bond, the shared pair of electrons come from the same atom. In $N H_{4}^{+}$ all the 4 valence electrons of N are bonded to the hydrogen atoms, thus it cannot act as an electron pair donor for the formation of dative bond.

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H C l (a q) + H_{2} O (a q) ⇌ H_{3} O^{+} (a q) + C l^{-} (a q)

N H_{3} (a q) + H_{2} O (a q) ⇌ N H_{4}^{+} (a q) + O H^{-} (a q)

N H_{3} + H_{2} O ⇌ N H_{4}^{+} + O H^{-}

N H_{3} + H_{2} O ⇌ N H_{4}^{+} + O H^{-}

N H_{3} + H_{2} O \to N H_{4}^{+} + O H^{-} i s :

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