BONDING

"CH bond is definitely more polar than CC .thus undergoes cleavage easier than CC . hope It's clear.-Srinath"

But the discussion was that CH is strongest....thats the answer sky gave as in her soln...

your Fajan's rule seems fine , but could u xplian what u meant by small cation . more polarisation??and why CH seems stronger unable to get ur poinit

CH bond is definitely more polar than CC .thus undergoes cleavage easier than CC . hope It's clear.

You mean CC bond is stronger ?

Also, according to fajans rule, small cation = more polarisation and more covalent... So CH is stronger ..

And in other options, C is cation right ? ( more positive)

ok , atlast I think I've foud a convincing answer.

All these bond dissociation energies that are mentioned refer to breaking of bonds by the action of heat. i.e. thermal cleavage. but , In the reaction medium , more important is the polarity of the bond. CH bond is definitely more polar than CC .thus undergoes cleavage easier than CC . hope It's clear.

aren't we supposed to consideronly single bonds b/w the atoms? I don't think it's fair considering a double bond for one and triple bond for another , bcoz sky's Q asks only for the single bond energy I bleieve. double and triple bonds are obviously stronger.

i also thought the reasons(see my first two posts in this topic) for C-N and C-O bonds it worked gud for C-N but not that gud for C-O...

Oh this is bad about chem. experimental and theoritical beliefs always contradict.

oops , I didn't know that , thankx . I thought bonding b/w like atoms produces the strongest bond.
but I'm abit confused. In Bayer villiger oxdn , it's easier to convert aldehyde to acid than a ketone to an ester . so I thought C-C is more storng.

Srinath just see the general chemistry forum :

Forum » General Chemistry » Some reference datas........

can u xpalin the experimental result that C-H bond energy > C-C so how u r saying C-C is strongest...

the nodal plane is the molecular plane.

the strongest bond is C-C

nodal plane is the plane where probability of finding an electron is zero.

so b and c shouled not bhee answer

2nd part all these are single bond?

I AM CONFUSED..........

No but in NCERT(Chem part II edtn nov 2007,page 293, Example 10.5) also is written C-C bond is more stable than C-N and
for C-O bond the nucleophilcity of CN and OH??

so i think C-O should be strongest.......

PHEW!!!!!!!! ALL MY FLOP CONCEPTS NOT WORKING....
......btw y dun we go by bond order as nishant bhaiya told???

C-O = 3
C-N=2.5
C-C =2
C-H =0.5

now ..............
most surpringly..........
C-H is most strongest........(the ans given)
i can think of only one explanation for this......i.e. electronegative diff btwn C n H is highest mong the four so more ionic character ....... n so, stronger bong .......

comment.....

I think that should also be true for C-C and C-N bond as -CN is formed more favourably thab -NC> When CN^- is present and due to rresonance it can attack via N or C but it generally by C so.......

Also C-N and C-O bond has almost same properties as C=O and C=N has almost same rkns...

So C-C bond strength>C-N
also C-C bond strength>C-O

but don't know about comparison b/w C-O and C-N

for C-H bond i think its weaker because its C-H bond aur jaha thoda acidic H hota ha,i bond toot jata hai.......

We have got only bond orders of molecules having same atom...

but i know one thing C-C bond is stronger than C-O bond thats why CN^- is stronger nucleophile than OH^- although a weker base than OH^-