What is the correct order of reagents to achieve the following synthesis? CH_3CH
ID: 989514 • Letter: W
Question
What is the correct order of reagents to achieve the following synthesis? CH_3CH_2CH_2MgBr H_20 MgBr; H_20 HBr NBS, light, CCl_4 Zn(Hg)/HCL A B, C E, C E, D E, B, C Aromatic rings can undergo reactions by__________. The mechanism of this reaction produces an intermediate similar to the one found in the_________ mechanism. The carbocation is then removed through elimination to reform the aromatic ring. SN2, SN1 EAS, addition SN2, addition EAS, SN2 What is the product of the following reaction? What is the product of the following reaction?Explanation / Answer
1. The reaction first follow clemmensen reduction in the presence of amalgamated zinc and HCL followed by reaction with NBS. Hence the answer is D
clemension reduction mechanism:
followed by bromination by NBS in presence of light by below type of mechanism
2. The aromatic rings can undergo reactions by electrophilic substituion reactions as carbonium ion in aromatic rings are well stabilizes with resonance. We can observe the reaction mechanism in question 4.
The mechanism of the reaction produces an intermediate similar to one found in the aromatic electrophilic substitution
The carbocation is then removed through elemination to reform the ring by aromatic electrophilic substitution , addition. hence the correct option is b.
3. This is the example of halogenation of benzene by electrophilic substitution in presence of aluminium halide or iron. Electrophile Br+ is generated from Br2 due to catalytic action in presence of AlCl3 with below mechanism. Hence the answer is B, Bromo benzene.
4. This the reaction of nitration of benzene by electrophilic substitution. Hence answer is D
The reaction mechanism is follows
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