7. Find o, p-deactivating substituent in EAS reaction. 8. Rank the following com
ID: 705628 • Letter: 7
Question
7. Find o, p-deactivating substituent in EAS reaction. 8. Rank the following compounds in the order of reactivity for electrophilic aromatic substitution (EAS) reaction, starting from highest to lowest reactivity cases. b.IV 111111() ?? ? Ill a lll III IV d.Nii III l III IV 9. Halogen atom withdraws electron from benzene along the sigma bond. Resultant reactivity of benzene in EAS reaction is reduced. What is the name of the effect? nance Effect b. Inductive Effect c. Synergy Effect d. Constructive Effect 10. Find compound that shows maximum absorption peak at longest wavelength in UV-Vis Spectrum a. propane b. cyclohexane c.benzene d. styreneExplanation / Answer
7) -OH, -Cl, -CH3, -NH2, are O/P activating groups as each of them are electron donating. Only -NO2 group is electron withdrawing and hence it is O/P deactivating group. The reason does not stabilize Wheland intermediate in EAS reaction.
Answer is option e. -NO2
8) -ve charge on oxygen is more electron donating by resonance and hence phenoxide ion I) is most reactive. -OR also have the lone pair of electrons in conjugation with the ring and hence it also activates the ring for EAS but not as phenoxide. -R is also activating group but by inductive effect and not by a resonance effect. Inductive effect is not that great as resonance and hence -R is not activating as -OR. Thus the order of reactivity for EAS reaction is: I > II > IV > III. Answer is option c.
9) Halogen atom withdraws electron from benzene along s bond by the Inductive effect. (by resonance effect halogen donates an electron to the ring!) Answer is option b).
10) Styrene has more extended conjugation with an aromatic ring and hence it will show maximum absorption peak at the longest wavelength. Answer is option d. styrene.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.