This thesis is cosisted of two parts. In the first part the process of synthesizing linear alkyl benzene via the transalkylation reaction of 1,4-didodecyl benzene is highlighted. 1,4-didodecyl benzene was used as a model compound that is similar to heavy alkyl benzene. we have investigated the reaction of 1,4-didodecyl benzene with toluene in the presence of acidic zeolites such as H-beta and H-mordenite. In the second part a new glucose sensor via functionalizing carbon nanotub multilayer as a proper base was synthesized. To achieve such a goal, two different anchor type ligands with different lengths have been synthesized and then silver nanoparticles were immobilized on them. LABS is an active surfactant that is used to produce laundry powder and dish sub in detergent industry. Besides, high level of benzene is produced in petroleum industry annually; LAB is produced from the reaction of benzene with olefin and then it is converted to LABS. In the reaction of benzene with olefin not only LAB, but also heavy alkyl benzenes (HAB) which have 2 or 3 alkyl chains are produced. Considering what mentioned, we have tried to produce LAB from HAB via transalkylation process. Also 1,4-didodeyl benzene is used as a similar model as HAB. This transalkylation reaction in the presence of beta zeolite is performed in two different systems: a batch system and a contineous system is a sub- and supercritical toluene with the H-beta zeolite (SiO 2 /Al 2 O 3 =38). The reaction is reached to an optimal conditons for these two systems and in these conditions the operation of beta and mordenite zeolites with different ratio of SiO 2 /Al 2 O 3 are survayed and the best catalyst is introduced. Then HAB transalkylation reaction has been done with toluene in optimal conditions in the presence of the best catalyst that was beta zeolite (SiO 2 /Al 2 O 3 =38). The extension of selectivity of LAB can be increased if benzene is used instead of toluene and by removal of some side transaction. Nowadays glucose sensor is one of the successful sensors that is used to measure blood glucose concentration, because of its good electrical connection, carbon nanotube multilayer is useful for diabeties. In this part of the thesis the carbon nanotube multilayer was functionalized, with two different end groups one with an amine and the other with a thiol compound, then silver nanoparticles were immobilized on them.