- AEster
- ✓Ether
- CKetone
- DAlcohol
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$(A)$ $\mathrm{Bi}_2 \mathrm{O}_5$ is more basic than $\mathrm{N}_2 \mathrm{O}_5$
$(B)$ $\mathrm{NF}_3$ is more covalent than $\mathrm{BiF}_3$
$(C)$ $\mathrm{PH}_3$ boils at lower temperature than $\mathrm{NH}_3$
$(D)$ The $\mathrm{N}-\mathrm{N}$ single bond is stronger than the $P-P$ single bond

Statement - $I$: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow $\mathrm{S}_{\mathrm{N}} 2$ mechanism.
Statement - $II$: A secondary alkyl halide when treated with a large excess of ethanol follows $\mathrm{S}_{\mathrm{N}} 1$ mechanism.
In the the light of the above statements, choose the most appropriate from the questions given below: