On generalization of wiener index for cyclic structures

We have critically examined a particular generalization of Wiener index to cyclic structures known as Szeged index. Limited ability of Szeged index to give fair correlation of boiling points of cycloalkanes was traced toa deficiency in its definition which leads to great variation in index values between odd member cyclic systems and even member cyclic systems, both of which show similar boiling points. A remedy is suggested for construction of Wiener index more suited for cyclic structures.