MCQ
Most reactive toward $SN^2$
- ✓$CH_3 -Cl$
- B$CH_2 = CH -Cl$
- Cclorobenzene
- D$CH_3 -F$
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(Given atomic number: $\mathrm{C}: 6, \mathrm{Na}: 11, \mathrm{O}: 8$, $\mathrm{Fe}: 26, \mathrm{Cr}: 24 \mathrm{~J}$
$A.$ $KF > KI ; LiF > KF$
$B.$ $KF < KI ; LiF > KF$
$C.$ $SnCl _4 > SnCl _2 ; CuCl > NaCl$
$D.$ $LiF > KF ; \quad CuCl < NaCl$
$E.$ $KF < KI ; CuCl > NaCl$

(Given $\ln 10=2.3, R =8.3 JK ^{-1} mol ^{-1}, \log 2=0.30$ )