Question

Which of the following is most reactive towards aqueous NaOH?
A) ${C_6}{H_5}Cl$
 B)${C_6}{H_5}C{H_2}Cl$
 C)${C_6}{H_5}Br$
 D)$Br{C_6}{H_4}Br$

Answer 1

Hint: In chemistry, an aryl halide is an aromatic compound in which one or more hydrogen atoms are directly bonded to an aromatic ring and further they are replaced by a halide. Basically, aromatic halides are less reactive than alkyl or alkyl halides.

Complete step by step answer:
Basically alkyl halides are also known as haloalkanes. These are the chemical compounds that are often derived from alkanes that contain one or more halogen. Moreover, we can also say that alkyl halides are a subset of the general class of halocarbons.
Further, the classification of these compounds depend upon how the halogen atom is positioned on the chain of carbon atoms. They are of three types:
1.Primary alkyl halide
2.Secondary alkyl halide
3.Tertiary alkyl halide
Now, these are less soluble in water. Some amount of energy is required to dissolve them in water. However, they are more soluble in organic solvents than in water. So, among the given options ${C_6}{H_5}C{H_2}Cl$ is most reactive towards aqueous NaOH. The reaction is as shown:
 ${C_6}{H_5}C{H_2}Cl + NaOH \to NaCl + {C_6}{H_5}C{H_2}OH$
Moreover, the chemical reactions of haloalkanes can be divided into three categories:
1.Nucleophilic substitution reaction
2.Elimination reaction
3.Reaction with metals.
Hence, option B is correct.

Note: Many organic compounds containing halogens occur in nature and some of these are clinically useful. These compounds find goof applications in industry as well as in or day to day life. Moreover, chlorine containing antibiotic, chloramphenicol produced by the soil microorganisms is very effective for the treatment of typhoid fever. They are also used as solvents for relatively non-polar compounds and as starting materials for the synthesis of a wide range of organic compounds.