Question

Are the following statements true or false?
A pi bond consists of two pairs of electrons.
A triple bond consists of one pi bond and two sigma bonds.
End-to-end overlap results in a bond with electron density above and below the bond axis.
Two pi bonds comprise a double bond.
A sigma bond allows rotation about its bond axis.
Bonds formed from atomic p orbitals are always sigma bonds.

Answer 1

1) A bond consists of one sigma and one pi bond and each bond is made of one electron pair. Thus a pi bond has two electron pairs . statement is TRUE

2) A triple bond consists of one one pi bond and two sigma bond. statement is TRUE

3) end to end overlap forms sigma bond and side on overlap forms pi bond. In sigma bond the electron density is between the two nuclei and in pi bond electron density is above and below the axis

since end to end overlap forms sigma bond thus electron density will be between the nuclei. statement is TRUE

4) A double comprises exactly one pi bond one sigma bond hence statement is FALSE

5) Rotation is allowed in sigma bond about its bond axis hence statement is TRUE

6) s-orbitals are spherical in nature and have symmetric electron density in all the directions. Thus they always form sigma bonds. hence statement is TRUE

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