4AB › Chemistry PYQ › CSIR-NET › December 2011 › Q58Q58 · CSIR-NET Chemistry, December 2011 Paper: CSIR-NET December 2011 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy
The final product (s) of the reaction $\mathrm{P}(\mathrm{OR})_{3}+\mathrm{R}^{\prime} \mathrm{X}$ is/are
(a) $\mathrm{R}^{\prime} \mathrm{PO}(\mathrm{OR})_{2}$ and RX
(b) $\left[\mathrm{R}^{\prime} \mathrm{PO}(\mathrm{OR})_{2}\right] \mathrm{X}$
(c) $\left[\mathrm{R}^{\prime} \mathrm{RPO}_{2}(\mathrm{OR})\right] \mathrm{X}$
(d) ROR'and $\mathrm{P}(\mathrm{OR})_{2} \mathrm{X}$
Answer Answer: A ✓ checked by 4AB · confidence high
Explanation Michaelis–Arbuzov: the phosphite is alkylated at P, and the halide then dealkylates the phosphonium ion, giving the phosphonate R′P(O)(OR)₂ and the alkyl halide RX.
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