1 Which of the following is the fastest SNI reaction? CHE302 Q2VIII 201830 CH3 C
ID: 705252 • Letter: 1
Question
1 Which of the following is the fastest SNI reaction? CHE302 Q2VIII 201830 CH3 CH2 Br CH CH3 H3 Cl CH3 CH3 ?? CH3 CH2 CH CH Br Cl CH2 CH2 CH2 (d) Hscc Br H3C CH2 CI 2 Which of the following is correct for E2 mechanism? (a) Proton and leaving group leave simultaneously. (c) Proton substitutes the leaving group. (b)Proton leaves first. (d) Leaving group leaves first. 3 Energy diagram of an Sx2 reaction shown below represents three curves for three solvent types. Which of the following is correct about the type of solvent represented by curve# 1 , 2 and 3 in the diagram? 3 Reaction progress (a) 1 is polar protic, 2 is nonpolar and, 3 is polar aprotic. (b) 1 is polar protic, 2 is polar aprotic and, 3 is nonpolar. (c) 1 is nonpolar, 2 is polar aprotic and, 3 is polar protic (d) 1 is polar aprotic, 2 is polar protic and, 3 is nonpolar.
Explanation / Answer
1. (b) because when the Br- leaves the cation formed is tertiary which is more stable than compared to other cations formed for a,c,d hence it is the fastest Sn1 reaction.
2. (a) because in E2 elimination mechanism the leaving group departs at the same time as the base attacks and is a single transition step.
3. (b) I is polar protic, II is polar aprotic and III is nonpolar
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