Given the following data: AHr [CH«(g)] = -75 kJ mol·' C(graphite) → C(g) AH =+712 kJ mol" 1/2H:(g) → H(g) AH =+215.5 kJ mol· 13. The bond enthalpy in kJ mol" of the C-H bond in methane is A +375 в +412 C 375 D -412
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.
![Given the following data:
AHr [CH:(g)] = -75 kJ mol·
C(graphite) → C(g) AH = +712 kJ mol
1/2H2(g) – H(g) AH = +215.5 kJ mol
13.
The bond enthalpy in kJ mol·' of the C-H
bond in methane is
A +375
B +412
C 375
D -412](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5adc4cb7-305b-4067-a31a-706a4336ac3c%2F94270e22-4bec-45af-980c-a1f1b9dadbff%2Fi3xl4dn_processed.png&w=3840&q=75)
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