The C-H bond and C-C bond in ethane are formed by which of the following types of overlap?

The C-C bond length in ethane is:

The number of C-H bonds in ethane molecule are :

IF z-axis is the bond forming axis, then which of the following type of overlap cannot form pi -bond [orbitals given are of two different atoms]?

In ether , two C-O sigma bonds are formed by which overlap ?

In which reaction C-C bond is formed.

The H-C=C ( or C=C-H) bond angle in ethane is