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In the chemical reaction given above $A$ and $B$ respectively are :
  • A$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
  • B$\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$
  • C$\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$
  • D$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
JEE MAIN 2021, Difficult
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