Since the discovery of Carbon Nanotubes (CNTs) by Iijima in 1991, the outstanding electrical, thermal and mechanical properties have gained huge interest worldwide. To explore the mechanical properties, the growth of Carbon Nanotubes (CNTs) via Chemical Vapor Deposition method and its functionalization for evaluating their performance in polymer matrix was elucidated in this paper. To begin with, at temperature of 750 oC, CNT growth process was commenced. Further, to examine the strength of polymer matrix, acid functionalization was performed using acid mixture (H2SO4: HNO3), which also results in removal of metal catalyst impurities. Moreover, acid treatment results in carboxyl group attachment onto the CNT surface. The COOH group gets attached at the defects, ends and at sidewalls of CNTs. In addition to this, carboxyl acid functionalized CNTs were reacted with amine resulting in amide functionalization. The functionalization improved the solubility of CNTs in various solvents. All the prepared samples were successfully characterized using SEM, EDX, FTIR, XRD, RAMAN and BET. To examine the mechanical properties of different samples, nano composites were formed. As grown CNTs, acid functionalized CNTs (CNT-COOH) and amide functionalized CNTs (CNT-CONH-NH2) were dispersed in polymer for 25 minutes under sonication. Dispersed CNTs was cured by adding epoxy hardener and poured in a mould to prepare nano composites. All the 4 nano composite samples (including neat epoxy) were cut down in desired dimensions to perform 3- point bend test and micro hardness test for different nano composites to analyze the mechanical strength. All the results were compared and observed that the CNTs that were subjected to functionalization provide better reinforcement to epoxy matrix as compared to composite samples processed with grown CNTs.