1
Question
Which of the following compounds will give SN1 and SN2 reactions with considerable rate?
I.C6H5−CH2−Br
II.CH2=CH−CH2−Br
III.CH3−CH(Br)CH3
Select the correct answer from the codes below below.
Which of the following compounds will give SN1 and SN2 reactions with considerable rate?
I.C6H5−CH2−Br
II.CH2=CH−CH2−Br
III.CH3−CH(Br)CH3
Select the correct answer from the codes below below.
Open in App
Solution
The correct option is A I,IIandIII
The following compounds will give SN1 and SN2 reactions with a considerable rate.
I.C6H5−CH2−Br
II.CH2=CH−CH2−Br
III.CH3−CH(Br)CH3
I and II are primary alkyl halides. Hence, they do react by SN2 mechanism. However, the carbocation formed is stabilized by resonance with either C=C double bond or benzene ring. Hence, they also react by SN1 mechanism.
The compound III is a secondary alkyl bromide. It reacts by SN1 and SN2 mechanism.
However, the compound IV will undergo SN1 reaction faster than SN2 reaction as it is sterically hindered and the approach of the nucleophile from the side opposite to that of leaving group is difficult.
I.C6H5−CH2−Br
II.CH2=CH−CH2−Br
III.CH3−CH(Br)CH3
II.CH2=CH−CH2−Br
III.CH3−CH(Br)CH3
I and II are primary alkyl halides. Hence, they do react by SN2 mechanism. However, the carbocation formed is stabilized by resonance with either C=C double bond or benzene ring. Hence, they also react by SN1 mechanism.
The compound III is a secondary alkyl bromide. It reacts by SN1 and SN2 mechanism.
However, the compound IV will undergo SN1 reaction faster than SN2 reaction as it is sterically hindered and the approach of the nucleophile from the side opposite to that of leaving group is difficult.
Suggest Corrections
1
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
