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STD 12 - 6. Haloalkanes and Haloarenes — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 6. Haloalkanes and Haloarenes4 Marks
MCQ
Consider the nucleophilic attacks given below. Select in each pair that shows the  greater $S_{N^2}$ reaction rate.
  • A
    $(A-I);(B-IV);(C-VI);(D-VIII)$
  • B
    $(A-II);(B-III);(C-V);(D-VIII)$
  • ✓
    $(A-I);(B-III);(C-V);(D-VIII)$
  • D
    $(A-I);(B-III);(C-V);(D-VII)$
✓

Answer

Correct option: C.
$(A-I);(B-III);(C-V);(D-VIII)$
c
$(A)$ $Br^{\ominus}$ is best $L.G.$ than $\begin{matrix}
   O  \\
   ||  \\
   -O-C-Me  \\
\end{matrix}$

$(B)$ $SH^{\ominus}$ is best $Nu^{\ominus}$ than $MeSH$

$(C)$ $Cl^{\ominus}$ is best $Nu^{\ominus}$ than $I^{\ominus}$ in $DMSO$

$(D)$ In polar protic solvent $I^{\ominus}$ is better $Nu^{\ominus}$ than $Cl^{\ominus}$

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