Can the wings of birds and bat be considered homologous organs? Why ? why not.

Homologous organs are defined as the organs having a similar basic structure or similar anatomy but during evolution they have evolved into different forms for performing different functions. Bat wings are made up of flaps of skin which is stretched between the bones of the fingers and the arm while the wings of bird are made up of feathers extending all along the arm. This dissimilarity in the structure of their wings shows that the wings of the bird and bat are not inherited from a common ancestor. 

Thus, the wings of bird and bat are not homologous organs instead they are analogous organs because analogous organs are defined as the organs having different evolutionary origin but are evolved to perform the same function.