Which is NOT true of a double bond? a) It is the sharing of 4 electrons. b)It is longer than a single bond. c)It is weaker than a triple bond. d)it contains a sigma bond and pi bond

1 Answer
anor277
Apr 9, 2018

"Option b"..."an olefinic bond is SHORTER than a" C-C "bond..."

Explanation:

The modern chemical bond is conceived to result from the sharing of electron density between ATOMS such that internuclear repulsion is negated, and a net attractive force operates between the nuclei and the electronic cloud. For single sigma-"bonds", this electronic density is concentrated BETWEEN the atom-atom vector. For pi-"bonds", this electronic density is concentrated ABOVE and BELOW the atom-atom vector.

As a result of multiple bonding, i.e. say for an olefin H_2C=CH_2, the C=C distance drops from the 1.54xx10^-10*m observed for the standard C-C single bond, to 1.34xx10^-10*m observed in ethylene, and to 1.20xx10^-10*m observed in acetylene... And as a first year student, I will think you should be able to parrot these data off...

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