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Question
Which of the follwing statments are correct?
(i) α− Elimination is also known as 1,2-Elimination.
(ii) Carbene is an intermediate of E1 elimination.
(iii) In α− Elimination, leaving group and the proton are eliminates from same carbon.
(iv) Chloroform will undergo α− Elimination
Which of the follwing statments are correct?
(i) α− Elimination is also known as 1,2-Elimination.
(ii) Carbene is an intermediate of E1 elimination.
(iii) In α− Elimination, leaving group and the proton are eliminates from same carbon.
(iv) Chloroform will undergo α− Elimination
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Solution
The correct option is C (iii) and (iv)
There are two types of elimination reaction,
1. α− Elimination reaction
2. β− Elimination reaction
In α− Elimination reaction, the leaving group and the proton are removed from the same α− carbon which leads to formation of reactive carbene intermediate. Thus, statement (iii) is correct.
Since both leaving group and proton removes from single carbon it is also know as 1, 1-Elimination reaction. Thus, statement (i) is wrong.
In β− Elimination reaction, the leaving group and the proton are removed from the adjacent atoms i.e., leaving group from α− carbon and proton from β− carbon. It leads to the formation of alkene compounds.
In E1 mechanism, the reaction will go through carbocation intermediate. Thus statement (ii) is wrong.
Chloroform doesn't undergo β− Elimination reaction because it lacks β− carbon.
Chloroform will undergo α− Elimination reaction to give carbene intermediate.
There are two types of elimination reaction,
1. α− Elimination reaction
2. β− Elimination reaction
In α− Elimination reaction, the leaving group and the proton are removed from the same α− carbon which leads to formation of reactive carbene intermediate. Thus, statement (iii) is correct.
Since both leaving group and proton removes from single carbon it is also know as 1, 1-Elimination reaction. Thus, statement (i) is wrong.
In β− Elimination reaction, the leaving group and the proton are removed from the adjacent atoms i.e., leaving group from α− carbon and proton from β− carbon. It leads to the formation of alkene compounds.
In E1 mechanism, the reaction will go through carbocation intermediate. Thus statement (ii) is wrong.
Chloroform doesn't undergo β− Elimination reaction because it lacks β− carbon.
Chloroform will undergo α− Elimination reaction to give carbene intermediate.
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