Nucleophilic and Electrophilic Substitution in Aryl Halides

Q. Is methyl benzene be more reactive than sec methyl benzene towards electrophilic addition reaction

Q. Why is tertiary alkylhalide more reactive towards E1 and E2 mechanism than secondary and primary alkylhalide?

Q.

Which of the following is NOT a state function?

1. q

2. PV

3. q_rev/T

4. q + w

Q. The compound Y in the above sequence is

1. Cyclohexene
2. Cyclohexylamine
3. 2-Bromocyclohexylamine
4. 4-Bromocyclohexylamine

Q. Out of Ally chloride and benzylchloride which is more active towards Sn2 reaction.

Q.

Replacement of Cl of chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-dinitrochlorobenzene is readily replaced because

[CBSE PMT

1. NO₂ make ring electron rich at ortho and para

2. NO₂ withdraws e^- from meta position

3. denotes e^- at meta position

4. NO₂ withdraws e^- from ortho/para positions

Q. Toluene when refluxed with $B{r}_2$ in the presence of light mainly gives

1. o-Bromotoluene
2. p-Bromotoluene
3. Mixture of o- and p- bromotoluene
4. Benzyl bromide

Q.

Which reaction is used for the preparation of acetophenone?

1. Reimer-Teimann reaction

2. Wurtz-Fittig reaction

3. Friedel-Crafts reaction

4. Cannizzaro’s reaction

Q. Why is tertiary alkylhalide more reactive towards E1 and E2 mechanism than secondary and primary alkylhalide?

Q.

Unimolecular nucleophilic substitution is favoured by:

1. Bulky groups on the carbon of interest

2. Small groups on the carbon of interest

3. Non-polar solvents

4. None of the above

Q. Why does the change in entropy of the universe has to be positive forthe reaction to be spontaneous?

Q. why benzamide is least reactive towards water