An active catalyst composition for hydro-conversion of Light Cycle Oil involving the partial ring opening of multi-ring aromatics for the production of petrochemical feedstock, comprising: i. a carrier of the catalyst composition consisting of ultrastable Y zeolite as a major component in an amount of 50-90 wt%, wherein the ultra-stable Y zeolite has crystallinity in the range of 80-90%, SiO 2 /Al 2 O 3 mole ratio in the range of 5-7, unit cell size in the range of 24.5-24.7 Å, and acidity in the range of 1.2 - 1.8 mmol NH 3 /g as measured through Temperature Programmed Ammonia Desorption (TPAD),wherein the majority of the acid sites present in the ultrastable Y zeolite are weak acid sites and at least 70% of the ammonia desorption takes place in temperature range of 125°C - 375°C and the remaining in the temperature range of 375°C - 650°C; ii. binder comprising an alumina, wherein the binder is pseudoboehmite alumina and wherein the binder is a minor component of the carrier; iii. metals species selected from a group consisting of group VIB and VIIIB metals; wherein the group VIB metal is tungsten and the group VIIIB metals are selected from a group consisting of nickel, cobalt, and salts and mixtures thereof; and the metal from group VIB is present in the range of 13-20% whereas the metal from group VIIIB is present in the range of 2-6% of the total weight of the catalyst composition; and iv. additives selected from a group of nitrogen and oxygen containing organic compounds; wherein the organic additives are selected from a group consisting of ethylenediaminetetraacetic acid, ethanolamine, diethanolamine, triethanolamine, nitrilotriacetic acid, and mixture thereof; and said additives forms metal precursors on reacting with the metal species; wherein molar ratio of the additive to the Group VI metal component is in the range of 0.5 to 5; and the resultant catalyst composition on sulfidation is having active sites of WS 2 slabs of dimension in the range of 35-45 Å and wherein the slabs of metal sulfide active sites are required for hydro-conversion of the LCO with high activity and selectivity. i. a carrier of the catalyst composition consisting of ultrastable Y zeolite as a major component in an amount of 50-90 wt%, wherein the ultra-stable Y zeolite has crystallinity in the range of 80-90%, SiO 2 /Al 2 O 3 mole ratio in the range of 5-7, unit cell size in the range of 24.5-24.7 Å, and acidity in the range of 1.2 - 1.8 mmol NH 3 /g as measured through Temperature Programmed Ammonia Desorption (TPAD),wherein the majority of the acid sites present in the ultrastable Y zeolite are weak acid sites and at least 70% of the ammonia desorption takes place in temperature range of 125°C - 375°C and the remaining in the temperature range of 375°C - 650°C; ii. binder comprising an alumina, wherein the binder is pseudoboehmite alumina and wherein the binder is a minor component of the carrier; iii. metals species selected from a group consisting of group VIB and VIIIB metals; wherein the group VIB metal is tungsten and the group VIIIB metals are selected from a group consisting of nickel, cobalt, and salts and mixtures thereof; and the metal from group VIB is present in the range of 13-20% whereas the metal from group VIIIB is present in the range of 2-6% of the total weight of the catalyst composition; and iv. additives selected from a group of nitrogen and oxygen containing organic compounds; wherein the organic additives are selected from a group consisting of ethylenediaminetetraacetic acid, ethanolamine, diethanolamine, triethanolamine, nitrilotriacetic acid, and mixture thereof; and said additives forms metal precursors on reacting with the metal species; wherein molar ratio of the additive to the Group VI metal component is in the range of 0.5 to 5; and the resultant catalyst composition on sulfidation is having active sites of WS 2 slabs of dimension in the range of 35-45 Å and wherein the slabs of metal sulfide active sites are required for hydro-conversion of the LCO with high activity and selectivity.