50. Answer is option (A) 1 < 2 < 4 < 3 Reason: Bromo benzene will not undergo nu
ID: 700472 • Letter: 5
Question
50.
Answer is option (A) 1 < 2 < 4 < 3
Reason:
Bromo benzene will not undergo nucleophilic substitution therefore it least compare to other compound
Among alkyl halide tertiary alky halide will undergo SN1 mechanism in more prefered manner compare to secondary therefore compound 2 is second least
Among 3 and 4 carbocation is more stable due to resonance therefore compound 4 is third least and finally compound 3 will undergo SN1 in more promising manner
51. Answer is option (B)
Reason: polar aprotic solvent favour SN2 mechanism therefore inversion of configuration occur in product since the staring material has R-configuration the product will have S-configuration that is option (B)
52.
Answer is option (C)
Reason:
The starting material has active methylene group therefore base abstraction will occur when treated with base followed by carbon carbon bond formation with 1,4 dibromo butane and followed by cyclization. In final step ester is hydrolysed to acid and on heating CO2 is liberated to give option (C) compound as product.
53.
Answer is option (B)
Reason:
Nitro is electron withdrawing therefore substitution will not occur in nitro substituted ring, where as in other ring two electon releasing group there, among them hydroxy will have more electron donating nature compare to methyl therefore substitution will be para to hydroxy group.
54.
Answer is option (C)
55.
Answer is option (D)
Reason:
OTf is good leaving group compare to other compound leaving group.
56.
Answer is option (A)
Reason :
NBS is reagent for allylic bromination
Explanation / Answer
So. Arrange the bromides in order of increasing rates for Sl . To which position will an electrophile most likely add in substitution in EtOH an electropbilic aromatic substitution reaction? Br Br (A) 152
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