Nitration of Aromatics

Q. The structures of the σ-complex formed during the nitration of anisole would be:

1. 
2. 
3. 
4. 

Q. Nitration of benzene by conc. nitric acid and conc. sulphuric acid is an exampe of:

1. Electrophilic substitution reaction
2. Electrophilic addition reaction
3. Nucleophilic substitutionreaction
4. Free radical substitution reaction

Q. The compound that is most reactive towards electrophilic nitration among the following is:

1. Toluene
2. Benzene
3. Benzoic Acid
4. Nitrobenzene

Q. Nitrobenzene can be prepared from benzene by using a mixture of conc.$HN{O}_3$ and conc.$H_{2}S{O}_4$.In the nitrating mixture, $HN{O}_3$ acts as a

1. Base
2. Acid
3. Reducing agent
4. Catalyst

Q. Two gases $P$ and $Q$ both decolourise aqueous bromine but only one of them gives white ppt with Tollen’s reagent. $P$ and $Q$ are likely to be:

1. $\text{HC}\equiv \text{CH}\text{and}{\text{CH}}_3–{\text{CH}}_2–C\equiv CH$
2. $\text{HC}\equiv \text{CH}\text{and}{\text{CH}}_3–\text{C}\equiv \text{CH}$
3. ${\text{CH}}_3–{\text{CH}}_2-\text{C}\equiv \text{CH}\text{and}{\text{CH}}_3–\text{C}\equiv \text{C}-{\text{CH}}_3$
4. ${\text{H}}_2{\text{C=CH}}_2\text{and}{\text{CH}}_3–\text{C}\equiv \text{C}-{\text{CH}}_3$