Note that configuration has been rotated in A If (B) is the only compound obtained, the process is called inversion
of configuration Configuration has been inverted in B Rationalised 2023-24
179 Haloalkanes and Haloarenes
If a 50:50 mixture of  A and B is obtained then the process is called
racemisation and the product is optically inactive, as one isomer will
rotate the plane polarised light in the direction opposite to another