Arrange the following carbocation in increasing order of their stability:

a)
I > II > III
b)
II > III > I
c)
III > II > I
d)
II > I > III
Correct answer is option 'A'. Can you explain this answer?

Question

Arrange the following carbocation in increasing order of their stability:a)I > II > IIIb)II > III > Ic)III > II > Id)II > I > IIICorrect answer is option 'A'. Can you explain this answer?

Accepted Answer

F shows -I effect and hence it will decrease the stability of carbocation.
so it should be 2>3>1.

Answer

In Carbonation CF3+ ,the lone pair of elections on each of the the three F atoms overlap with empty 2p orbital of carbon atom carrying +ve change thereby dispersing the position change and thus stabilizing the carbon .....and the dispersing the +ve change decrease with decrease in F atoms and thus it's stability also decrease...

Answer

No ans is C bcoz +charge can't be stabilised by electronegative atom

Answer

I think back bonding is the main reason for the stability of cf3 + compound

Answer

As we know tertiary Carbocations are more stable, Despite the strong electron-withdrawing ability of fluorine atoms, the α-fluorine atom can stabilize carbocations through the interaction between the lone-pair electron of fluorine and the unoccupied p-orbital of the cationic carbon center. Fluorine always stabilises a carbocation to a large extent because of a very good overlap of 2p − 2p orbitals. Hence option A is definitely correct.

Answer

Confused

Answer

A option is correct becz of back bonding

Answer

Fluorine atom will share it's lone pair of electron with empty orbital of carbon thereby making in more stable.

Answer

F shows -I effect and hence it will decrease the stability of carbocation.
so it should be 3>2>1

Answer

F will decrease the positive charge on carbocation through back bonding. Hence more F means more back bonding and less positive charge

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