Which halide does NOT undergo Williamson's synthesis (an aryl halide)

1. A.
   $\text{C}_2\text{H}_5\text{Br}$
2. B.
   $\text{CH}_3-\text{CH}(\text{CH}_3)-\text{CH}_2-\text{Cl}$
3. C.
   $\text{C}_6\text{H}_5\text{Cl}$
4. D.
   $\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-Cl}$

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1. A.
   $\text{C}_{2}\text{H}_{5}\text{Cl}$
2. B.
   $\text{CH}_3-\text{CH}(\text{CH}_3)-\text{CH}_2-\text{Cl}$
3. C.
   $\text{C}_{6}\text{H}_{5}\text{Cl}$
4. D.
   $\text{CH}_{3}\text{CH}_{2}\text{CH}_{2}\text{Cl}$

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1. A.
   $\mathrm{C_2H_5Br}$
2. B.
   $\mathrm{CH_3{-}\underset{\displaystyle CH_3}{\underset{|}{CH}}{-}CH_2{-}Br}$
3. C.
   $\mathrm{C_6H_5 - Br}$
4. D.
   $\mathrm{C_6H_5 - CH_2 - Br}$

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