Question

Rank each group of compounds from most reactive to least reactive toward electrophilic aromatic substitution:
e. p-methylnitrobenzene, 2-chloro-1-methyl-4-nitrobenzene, 1-methyl-2,4-dinitrobenzene, p-chloromethylbenzene

Accepted Answer

Step 1: Understand the concept of electrophilic aromatic substitution (EAS). EAS reactions involve the substitution of a hydrogen atom on an aromatic ring with an electrophile. The reactivity of the aromatic ring depends on the electronic effects of substituents already present on the ring, which can either activate or deactivate the ring toward electrophilic attack. Step 2: Analyze the substituents on each compound. Substituents can be electron-donating groups (EDGs) or electron-withdrawing groups (EWGs). EDGs increase the electron density on the aromatic ring, making it more reactive toward electrophiles, while EWGs decrease the electron density, making the ring less reactive. For the given compounds: 
- p-Methylnitrobenzene has a methyl group (EDG) and a nitro group (EWG).
- 2-Chloro-1-methyl-4-nitrobenzene has a chloro group (weak EWG), a methyl group (EDG), and a nitro group (strong EWG).
- 1-Methyl-2,4-dinitrobenzene has a methyl group (EDG) and two nitro groups (strong EWGs).
- p-Chloromethylbenzene has a methyl group (EDG) and a chloro group (weak EWG). Step 3: Evaluate the net electronic effects of the substituents on the aromatic ring. Consider the relative strength of the activating and deactivating groups. For example, nitro groups are strong deactivators due to their strong electron-withdrawing nature, while methyl groups are weak activators. The presence of multiple nitro groups will significantly reduce the reactivity of the ring. Step 4: Rank the compounds based on their reactivity toward EAS. The compound with the most electron-donating substituents and the least electron-withdrawing substituents will be the most reactive. Conversely, the compound with the most electron-withdrawing substituents will be the least reactive. Consider the positions of the substituents as well, as ortho/para-directing groups can influence the reactivity differently than meta-directing groups. Step 5: Finalize the ranking. Based on the analysis, rank the compounds from most reactive to least reactive toward electrophilic aromatic substitution. Use the electronic effects of the substituents and their positions on the aromatic ring to determine the order.

Rank each group of compounds from most reactive to least reactive toward electrophilic aromatic substitution:
e. p-methylnitrobenzene, 2-chloro-1-methyl-4-nitrobenzene, 1-methyl-2,4-dinitrobenzene, p-chloromethylbenzene

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Electrophilic Aromatic Substitution (EAS)

Activating and Deactivating Groups

Ortho/Para vs. Meta Directing Effects

Rank each group of compounds from most reactive to least reactive toward electrophilic aromatic substitution:e. p-methylnitrobenzene, 2-chloro-1-methyl-4-nitrobenzene, 1-methyl-2,4-dinitrobenzene, p-chloromethylbenzene

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Electrophilic Aromatic Substitution (EAS)

Activating and Deactivating Groups

Ortho/Para vs. Meta Directing Effects

Rank each group of compounds from most reactive to least reactive toward electrophilic aromatic substitution:
e. p-methylnitrobenzene, 2-chloro-1-methyl-4-nitrobenzene, 1-methyl-2,4-dinitrobenzene, p-chloromethylbenzene