Arrange these carbocations in order of increasing stability: (а)-CH3(b)-CH3(c)-CH2O A-B-CO A-C-BO B-C-AO B-A-CC-A-BC-B-A

The stability order of carbocations are as follows, Tertiary > Secondary > Primary > Methyl

Answered: (a) -CH3 (b) -CH3 (c) -CH2 O A-B-C O…

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(a) -CH3 (b) -CH3 (c) -CH2 O A-B-C O A-C-B O B-C-A O B-A-C C-A-B O C-B-A

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL3: Carbon (13c) Nmr Spectroscopy

Section: Chapter Questions

Problem 8CTQ

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Concept explainers

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.

Question

Arrange these carbocations in order of increasing stability:

(а)
-CH3
(b)
-CH3
(c)
-CH2
O A-B-C
O A-C-B
O B-C-A
O B-A-C
C-A-B
C-B-A

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