Some generating functions of modified Gegenbauer polynomials

L Weisner's group theoretic method has been introduced in the study of special function. In this paper we obtain two differential operators, one of which simultaneously raises the index and lowers the parameter of modified Gegenbauer polynomialsC _n ^v+n (x) by unity and the other acts onC _n ^v+n(x) in the reversed way by suitable interpretation to the indexn and the parameterv ofC _n ^v+n(x) . We have also found out the extended form of the groups generated by the operatorsA _ij(i,j=1,2). We have also derived some novel generating functions ofC _n ^v+n (x) from which several special generating functions can be easily derived.