For Et₂ AlX (X=PPh₂⁻, Ph⁻, Cl⁻. and.H⁻), the tendency towards dimeric structure follows the order · ABC26IN0455

Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Element – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium

For $\mathrm{Et}_{2} \mathrm{AlX}\left(\mathrm{X}=\mathrm{PPh}_{2}^{-}, \mathrm{Ph}^{-}, \mathrm{Cl}^{-}\right.$ and $\left.\mathrm{H}^{-}\right)$, the tendency towards dimeric structure follows the order

(a)$\mathrm{PPh}_{2}^{-}>\mathrm{Cl}^{-}>\mathrm{H}^{-}>\mathrm{Ph}^{-}$

(b)$\mathrm{Cl}^{-}>\mathrm{PPh}_{2}^{-}>\mathrm{H}^{-}>\mathrm{Ph}^{-}$

(c)$\mathrm{Ph}^{-}>\mathrm{H}^{-}>\mathrm{Cl}^{-}>\mathrm{PPh}_{2}^{-}$

(d)$\mathrm{H}^{-}>\mathrm{Ph}^{-}>\mathrm{PPh}_{2}^{-}>\mathrm{Cl}^{-}$

Answer

Answer: A ✓ checked by 4AB · confidence medium

The source book printed D; on checking, A is correct — see the explanation.

Explanation

Bridging ability toward dimerisation follows the donor lone-pair strength of the bridge: PPh₂⁻ > Cl⁻ > H⁻ > Ph⁻ (a).

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