In the chemical reactions given above A and B respectively are :

1. ${\mathrm{H}}_3{\mathrm{PO}}_2$ and ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}$
2. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$ and ${\mathrm{H}}_3{\mathrm{PO}}_2$
3. ${\mathrm{H}}_3{\mathrm{PO}}_2$ and ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$
4. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}$ and ${\mathrm{H}}_3{\mathrm{PO}}_2$

Asked in: JEE Main 2021 (22 Jul Shift 1)

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