NOVELTY - Maximization of aromatics and butane from 5-6C noncyclic paraffin rich light naphtha cut using modified zeolite, comprises: (a) impregnating group-IIB or group-IIIA metal e.g. zinc to dried acidic zeolite extrudate by incipient wetness impregnation method; (b) loading group-IIB or group-IIIA metal supported zeolite catalyst in high pressure bench scale reactor and reducing the catalyst; (c) cooling metal containing zeolite bed; (d) contacting light naphtha containing hydrocarbons feed with catalyst bed in reactor; and (e) separating desired butane, toluene and xylene (BTX) rich 5-6C liquid.    USE - The process is useful for maximization of aromatics and butane from 5-6C noncyclic paraffin rich light naphtha cut (claimed), where the aromatics are useful as petrochemical feed stocks or gasoline blending stocks, and the butane is useful as domestic fuel including liquid petroleum gas.    ADVANTAGE - The process: optimizes the process conditions to maximize the butane yields with corresponding aromatics yields over light naphtha; produces butane with low yields of low cost dry gas from light naphtha cut; is safe and environmental friendly; does not require use of corrosive organic chloride additives; utilizes catalyst which shows similar activity even after ten regenerations or deactivations; and does not require hydrogen during feed cut in.    DETAILED DESCRIPTION - Maximization of aromatics and butane from 5-6C noncyclic paraffin rich light naphtha cut using modified zeolite, comprises: (a) impregnating 0.5-8 wt.% of group-IIB or group-IIIA metal comprising zinc, gallium or indium to dried acidic zeolite extrudate by incipient wetness impregnation method; (b) loading the group-IIB or group-IIIA metal supported zeolite catalyst in a high pressure bench scale reactor and reducing it by passing hydrogen, for a period of 2-5 hours, at 400-550 degrees C, and at a flow rate of 14-20 l/hour; (c) cooling the metal containing modified zeolite bed to a temperature of 300 degrees C under nitrogen atmosphere and increasing further the bed temperature to 300-600 degrees C; (d) contacting the feed of light naphtha containing hydrocarbons having carbon atoms of 5-6C with the catalyst bed in reactor, at a weight hourly space velocity of 0.5-8/hour, at a pressure of 1-20 kg/Cm2, for a period of at least 24 hours in the absence of nitrogen gas; and (e) separating the desired butane, toluene and Xyline (BTX) rich 5-6C liquid and butane from the resultant reaction mixture by known methods.