14. D-glucose is shown below. Which of the J. CHO H OH HO H- D-glucose HO- H- H- ČH2OH CHO CHO CHO CHO CHO H OH HO H H- HO- H OH -HO- HO- -H- HO- H OH HO H H OH -HO- H OH Но- H- HO H- HO -H- H OH ČH,OH HO-H CH2OH H OH ČH2OH HO H H OH CH2OH CH2OH a. b. с. d. e.
Reactive Intermediates
In chemistry, reactive intermediates are termed as short-lived, highly reactive atoms with high energy. They rapidly transform into stable particles during a chemical reaction. In specific cases, by means of matrix isolation and at low-temperature reactive intermediates can be isolated.
Hydride Shift
A hydride shift is a rearrangement of a hydrogen atom in a carbocation that occurs to make the molecule more stable. In organic chemistry, rearrangement of the carbocation is very easily seen. This rearrangement can be because of the movement of a carbocation to attain stability in the compound. Such structural reorganization movement is called a shift within molecules. After the shifting of carbocation over the different carbon then they form structural isomers of the previous existing molecule.
Vinylic Carbocation
A carbocation where the positive charge is on the alkene carbon is known as the vinyl carbocation or vinyl cation. The empirical formula for vinyl cation is C2H3+. In the vinyl carbocation, the positive charge is on the carbon atom with the double bond therefore it is sp hybridized. It is known to be a part of various reactions, for example, electrophilic addition of alkynes and solvolysis as well. It plays the role of a reactive intermediate in these reactions.
Cycloheptatrienyl Cation
It is an aromatic carbocation having a general formula, [C7 H7]+. It is also known as the aromatic tropylium ion. Its name is derived from the molecule tropine, which is a seven membered carbon atom ring. Cycloheptatriene or tropylidene was first synthesized from tropine.
Stability of Vinyl Carbocation
Carbocations are positively charged carbon atoms. It is also known as a carbonium ion.
![a. 0
b. 1
с. 2
d. 3
e. 4
14. D-glucose is shown below. Which of the choices below is its enantiomer L-glucose?
CHO
II
H OH
IV
HO H
D-glucose
H OH
HO-
ČH2OH
a.I
H-
Ja
CHO
CHO
СНО
CHO
CHO
H-
HO-
H OH
H-
-ОН
но
H-
Но-
-
HO-
--
Но
H-
HO-
H OH
HO-
H-
HO-
H-
HO-
HO
-H-
Но-
H-
HO
H-
H OH
ČH,OH
HO H
H-
HO-
HO H
H OH
CH,OH
CH2OH
CH2OH
CH2OH
a.
b.
С.
d.
e.
15. Which of the following statements describes lipids?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc0da3887-c4ea-4b9e-9efc-f9c8b5a90f3a%2F3cd851b7-05a5-4c33-8879-51dbdf3dbbad%2Fpm69zra_processed.jpeg&w=3840&q=75)
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