Which of the following is true of aldol reactions?
1.The thermodynamics and kinetics of aldol reactions can be controlled by base selection.
2.Aldol reactions can be completed by reacting an aldehyde and a ketone in the presence of a
base.
3.The yields of aldol reactions involving only one type of a hydrogen are generally higher than
the yields of those involving multiple types of a hydrogens.
4.Aldol reactions are used to create carbon–carbon bonds.
5.All of the above are true of aldol reactions.
Solution
Answer:
5.All of the above are true of aldol reactions.
Explanation:
Aldol reaction is the reaction between two cabonyl compounds with one carbonyl compound
contains one alpha -hydrogen in the presence of base to give beta hydroxy carbonyl compound.
So option 1 is correct.
The kinetic prodduct is the formation of C-C bond on the less substituted alpha carbon atom, can
be acheived by the bulky base LDA and thermodynamic product is the formation of C-C bond on
the more substituted alpha carbon to the carbonyl carbon can be achieved by the less bulky base
like NaOC2H5. so option 2 is correct.
If there are more kinds of active hydrogens gives mixed aldol product that gives less yield and
the compound with one kind of active hydrogen gives only one product with more yield. So
option 4 is correct.
In aldol reaction there is a formation of c-c bond. so option 4 is also correct..
Which of the following is true of aldol reactions1.The thermodyna.pdf
1. Which of the following is true of aldol reactions?
1.The thermodynamics and kinetics of aldol reactions can be controlled by base selection.
2.Aldol reactions can be completed by reacting an aldehyde and a ketone in the presence of a
base.
3.The yields of aldol reactions involving only one type of a hydrogen are generally higher than
the yields of those involving multiple types of a hydrogens.
4.Aldol reactions are used to create carbon–carbon bonds.
5.All of the above are true of aldol reactions.
Solution
Answer:
5.All of the above are true of aldol reactions.
Explanation:
Aldol reaction is the reaction between two cabonyl compounds with one carbonyl compound
contains one alpha -hydrogen in the presence of base to give beta hydroxy carbonyl compound.
So option 1 is correct.
The kinetic prodduct is the formation of C-C bond on the less substituted alpha carbon atom, can
be acheived by the bulky base LDA and thermodynamic product is the formation of C-C bond on
the more substituted alpha carbon to the carbonyl carbon can be achieved by the less bulky base
like NaOC2H5. so option 2 is correct.
If there are more kinds of active hydrogens gives mixed aldol product that gives less yield and
the compound with one kind of active hydrogen gives only one product with more yield. So
option 4 is correct.
In aldol reaction there is a formation of c-c bond. so option 4 is also correct.
