One of the characteristic properties of the covalent DOUBLE bond is that:it is composed of a sigma bond of axial symmetry and a pi bond of planar symmetry.it is 1.5 times stronger than a single bond.it is made of two pi bonds each of them having a planar symmetry.it is made of a sigma and a pi bond, both of them having the same strength.the axes of the two bonds are perpendicular to each other.

The correct statement about the characteristic properties of a covalent double bond is: "It is composed of a sigma bond of axial symmetry and a pi bond of planar symmetry."

Here's why:

1. A covalent double bond is indeed composed of one sigma bond and one pi bond. The sigma bond is the first bond to be formed and has axial symmetry, meaning it is symmetrical around the axis connecting the two bonded atoms. The pi bond is the second bond to be formed and has planar symmetry, meaning it is symmetrical in a plane that is perpendicular to the axis connecting the two bonded atoms.

2. A double bond is not 1.5 times stronger than a single bond. It is stronger, but not by that exact ratio. The strength of bonds depends on many factors, including the atoms involved and the environment.

3. A double bond is not made of two pi bonds. As mentioned above, it is made of one sigma bond and one pi bond.

4. The sigma and pi bonds in a double bond do not have the same strength. The sigma bond is stronger.

5. The axes of the sigma and pi bonds are indeed perpendicular to each other. The sigma bond forms along the axis connecting the two atoms, while the pi bond forms above and below this axis.