Halogenation of Aromatic Compounds

Q. Among the following the reaction that proceeds through an electrophilic substitution is

1. 
2. 
3. 
4. 

Q. Which of the following act as electrophile in halogenation?

1. $C{l}_2$
2. $C{l}^{-}$
3. $C{l}^{+}$
4. None of the above

Q. In the reaction,


The electrophile involved is:

1. Dichloromethyl anion $(CHC{l}_2{)}^{-}$
2. Formyl cation $(CHO{)}^{+}$
3. Dichloromethyl cation $(CHC{l}_2{)}^{+}$
4. Dichlorocarbene $(:CC{l}_2)$

Q. Among the following the reaction that proceeds through an electrophilic substitution is

1. \( \stackrel{ Cu _{2} Cl _{2}}{\longrightarrow} \)
2. \( + HCl \) \( \stackrel{\text { Heat }}{\longrightarrow} \)
3. \( + Cl _{2} \) UV Light
4. \( \sqrt{\square}+ Cl _{2} \stackrel{ AlCl _{3}}{\longrightarrow} \longrightarrow Cl + HCl \)

Q. To which of the following four types does this reaction belong $B^{-}+R-A\to B-R+A^{-}$

1. Unimolecular electrophilic substitution
2. Bimolecular electrophilic substitution
3. Unimolecular nucleophilic substitution.
4. Bimolecular nucleophilic substitution.

Q. The electrophile involved in Reimer-Tiemann reaction is:

1. ${}^{⨁}CHC{l}_2$
2. $:CC{l}_2$
3. :CHCl
4. ${}^{\circ }CC{l}_3$

Q. $C{H}_{3}C{H}_{2}Cl+KOH(aq.)\to C{H}_{3}C{H}_2-OH+KCl$
The above reaction is:

1. nucleophilic substitution
2. electrophilic substitution
3. free - radical substitution
4. nucleophilic addition