NEET 2007
- Exam
- NEET
- Year
- 2007
- Subject
- Chemistry
- Chapter
- Hydrocarbons
NEET 2007 · Chemistry · Hydrocarbons
The order of decreasing reactivity towards an electrophilic...
The order of decreasing reactivity towards an electrophilic reagent, for the following would be:
(i) benzene
(ii) toluene
(iii) chlorobenzene
(iv) phenol
Options
- A(ii) (iv) (i) (iii)
- B(iv) (iii) (ii) (i)
- C(iv) (ii) (i) (iii)
- D(i) (ii) (iii) (iv)
Correct answer
C. (iv) (ii) (i) (iii)
Step-by-step solution
Electrophiles have high affinity for electrons. They attack at the site where electron-density is highest. Electron withdrawing substances increases the electron density. The electron withdrawing tendency decreases in the order :
Therefore, the correct order of reactivity towards electrophile is
Related Theory
Electrophilic substitution reaction in haloarenes occur slowly because halogen has a negative inductive effect, it decreases the electron density on the benzene ring due to resonance.