IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry

anirudhavasarala

How 2 predict the hybridisation between the 2nd and the 3rd carbons of the organic compd.

CHºC-CH=CH₂ ?

shikharbaid

is it sp3???numbering the carbon atoms from left, as
double bond>triple bond>single bond preference....

neal

hybridisation of a carbon atom in an organic compound is determined by the number of sigma bonds formed by that atom.

2 means - sp
3 means - sp2
4 means - sp3

beck2ham

Hello.

I agree with the priority order of shikharbaid.

it is indeed:-

double bond>triple bond

Now, numbering will be from left.

Therefore, the second carbon has only 1 pi-bond.

Thus, it is sp² hybridised as in the case of an alkene.

And, the 3rd carbon has two pi-bonds, thus, sp hybridised as in the case af an alkynes and allenes.

This is the simplest rule for identifying the hybridisation of carbon.

I suppose that you do do FIIT-JEE packages....is it right??

caprio.nups

for 2nd one its sp and for 3rd one its sp2..

arun-rashi

according to iupac name of compound is But -1-ene -3-yne so numbering starts from double side so 2nd carbon with double bond sp2 hybridastion while 3 carbon triple bond and sp hybridation.this is calculated by the formula ,no. of hybrid orbital =no. of sigma bond +no. of lone pair

ayonaaieee

yes i agree with u. it would be sp-sp2.

anirudhavasarala

Hi,
Thanks for the answers. So it will be sp-sp2. And the counting from right to left. But the order's a bit confusing (double>triple)Actually this is from OP Tandon..

beck2ham

The order you are talking about is the priority order of functional groups for IUPAC namenclature.

double>triple means that the priority of a double bond is more than a triple bond.

subhasish3319

sp3 is given more preference than sp2

chem4884

seeee

C bonded with four more atoms ie forming 4 sigma bonds is sp3 hyb

C ..................three ...................................3 sigma bonds & 1 pi bond, is sp2

C...................two ......................................2.......................2...........is sp hyb

hope it will help

plz rate the answer

sujaye

it is sp3

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