Which of the following substituents is a significant resonance acceptor? -OCH_3

Question

Which of the following substituents is a significant resonance acceptor? -OCH_3 -NH_3^+ -NH_2 -NO_2 CH_3 Reserveratrol (the structure shown below) found in red wine has been shown to be a potent antioxidant, significantly extending lifespan (by 10-50%) of many types of organisms by seavenging of harmful free radicals from mitochondria. Which effect of resveratrol on reaction proceeding through a free-radical intermediate, would you expect? No significant effect The reaction will be accelerated The reaction will be inhibited The reaction will switch to elimination The reaction will be able to proceed without light The molecule below is a metabolite of resveratrol formed in the liver. Which cha the resveratrol metabolite have in the blood environment (pK_a = 7.4)? pK_a values: Carboxy- group ~5; Phenols ~9, alcohols ~15 Positive charge on the carboxy-group Negative charge on the carboxy-group Positive charge on the phenol-group Negative charge on the phenol-group Negative charge on both phenol-groups

Explanation / Answer

8. Here option D is the correct answer

Here -NO2 is resonance acceptor. if -NO2 is attached with a benzene ring. So it will try to withdraw the lone pair of electron to its own end.

Resonance Acceptor is that part of resonating structure where the positive or carbonium ion is found.

Hence option D is the correct answer.

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