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a double bond consists of a sigma bond and a pi bond .....pi bond is formed by sideways overlapping of unhybridized p-orbitals of two carbon atoms above and below the plane of carbon atoms..if now one of the carbon atoms of double bond is rotated with respect to the other ,the p-orbitals will no longer overlap and pi bond should break....but the breaking of pi bond requires 251 kj/mole of energy which is not provided by collision of molecules at room temperature...consequently the rotation about a carbon-carbon double bond is not free but is strongly hindered or restricted....
while in carbon-carbon single bond only 12.55 kj/mole of energy is reacquired (this data is for ethane molecule) .....at room temperature the collission of molecules supply sufficient kinetic energy to overcome this energy barrier
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What is cis in term of chemistry?
It only happens around a c=c as there is no free rotation about the double bond. You need to have 2 of the same atoms/molecules on either side of that double bond. When they are both at the top or both at the bottom it is cis. When they are diagonally accross from each other it is trans. Hope this helps.... sorry if it doesnt make sense it is quite hard to discribe in words
What molecules permit free rotation about the carbon-carbon bond c2cl4 c2h2 c2h5cl c2h4?
C2H5Cl
What molecules permit free rotation about the carbon-carbon bond?
Chlorocthase C2H2Cl Ethanec C2H6 Chloroethane, C2H5Cl Ethane, C2H6
What are the three ways that atoms can bond with each other describe how each of these happen?
Ionic bond where electrons are transferred to form ions that attract by electrostatic charge Covalent bond where electrons are shared by both atoms Metallic bond where electrons are free to move around a lattice of metal atoms
Give the reasons for why the hydrogen is not found in free state?
it the smallest element with one valence electron and will bond to just about anything, theres no scenario in nature where hydrogen would not have another element around to bond to
What is cis in term of chemistry?
It only happens around a c=c as there is no free rotation about the double bond. You need to have 2 of the same atoms/molecules on either side of that double bond. When they are both at the top or both at the bottom it is cis. When they are diagonally accross from each other it is trans. Hope this helps.... sorry if it doesnt make sense it is quite hard to discribe in words
What causes an unsaturated fatty acid to have differ t shape than a satires fatty acid?
Unsaturated fatty acids have double carbon bonds.
What molecules permit free rotation about the carbon-carbon bond c2cl4 c2h2 c2h5cl c2h4?
C2H5Cl
What molecules permit free rotation about the carbon-carbon bond?
Chlorocthase C2H2Cl Ethanec C2H6 Chloroethane, C2H5Cl Ethane, C2H6
Is 1 comma 2-dichlorocycloprophane a Cis-Trans Isomer?
yes they are, because free rotation about a single bond is restricted due to cycle.
What type of bond is formed by the attraction between positively charged metal ions and free electrons around them?
a metallic bond
Why don't alkanes have geometric isomers?
Alkynes always form a triple bond. This being so, essentially, all you have are the two carbon molecules and the triple bond! No matter what way your turn it, or how you look at it, even if in a mirror (ie. optical isomerism) you will always have the same looking molecule while to have a geometrical isomer cis or trans form should be there. gen equation for a compound to be a geometrica isomer: 1.YXC = CXY 2.YXC = CXZ
What is the molecular geometry of c2h4cl2?
C2H4Cl2 (dichloroethane) has tetrahedral geometry around both carbon atoms. The geometry can be changed from free rotation to restricted rotation which has the formula of C2H2Cl2.
Why is polyunsaturated fats thinner?
Because the more unsaturated (= double bonded at every third C-atom with its following neighbour, hence the name: omega 3,6,9,.. etc.) fatty acid parts in the triglyceride are, the lower the melting point. This is because of the more 'stiff' character of a double bond (having no free internal rotation). A lower melting point gives it a more oily character and the fraction of solid 'fat' crystals is lower.
Does CO2 contain triple bond?
No, it has a triple covalent bond between the Carbon and the Oxygen This is a strange exception in chemistry because normally an Oxygen atom can only have 2 covalent bonds max, the Carbon retains a free valence electron (I think)
Can freely rotate about the carbon bonds because they only have single bonds?
Single bonds allow free rotation. Free rotation may be hindered sterically (large substituents that "bang" into one another " or due to hyperconjugation as in rotation barrier in ethane.
What is the molecular geometry of C3H6?
The molecule is H3C-CH3. At each C center the bonds are tetrahedral. There is free rotation about the C-C single bond
