constructing an alkene 1. I just need to verify the angles 2. what is the ideal
ID: 706255 • Letter: C
Question
constructing an alkene
1. I just need to verify the angles
2. what is the ideal bond angle centered at sp2 C?
3. do the measured angles in ethane match this ideal? if not explain why there is a deviation from this ideal angle
4. how do the CC bond lengths in ethane and ethene compare? how do the c-h bond lenghts in the two molecules compare? expain why they are different. hint use hybridization to explain the differences
Explanation / Answer
2. The bong angles at sp2 hybdridized carbon is 120 degrees..
3. No. They are not matching. This could be the attraction of bonded hydrogen towards the carbon. As the carbon electronegativity increases slightly.
4. C-C bond lengths in ethane are GREATER than C-C bondlenbths in ethene.
Because in ethane there is only single bond present between two carbons so they lies little bit longer compared to ethene. In ethene there is double bond between two carbons, they tightly bonded compared to ethane so bond length decreases.
The C-H bond in ethene is shorter than ethane because ethene CARBONS HAVE MORE ELECTRONEGATIVITY NATURE as they are in SP2 hybridization. So they attracts the neghbour hydrogens towards them. This results in decrease in C-H bond length in ethene. This does not happens in ethane because the carbons in ethane are in sp3 hybridization so they have not that much electron attractions nature.The bond length remains as it is.
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