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To probe the star-formation (SF) processes, we present results of an analysisof the molecular cloud G35.20$-$0.74 (hereafter MCG35.2) using multi-frequencyobservations. The MCG35.2 is depicted in a velocity range of 30-40 km s$^{-1}$.An almost horseshoe-like structure embedded within the MCG35.2 is evident inthe infrared and millimeter images and harbors the previously known sites,ultra-compact/hyper-compact G35.20$-$0.74N H\,{\sc ii} region, Ap2-1, andMercer 14 at its base. The site, Ap2-1 is found to be excited by a radiospectral type of B0.5V star where the distribution of 20 cm and H$\alpha$emission is surrounded by the extended molecular hydrogen emission. Using the{\it Herschel} 160-500 $\mu$m and photometric 1-24 $\mu$m data analysis,several embedded clumps and clusters of young stellar objects (YSOs) areinvestigated within the MCG35.2, revealing the SF activities. Majority of theYSOs clusters and massive clumps (500-4250 M$_{\odot}$) are seen toward thehorseshoe-like structure. The position-velocity analysis of $^{13}$CO emissionshows a blue-shifted peak (at 33 km s$^{-1}$) and a red-shifted peak (at 37 kms$^{-1}$) interconnected by lower intensity intermediated velocity emission,tracing a broad bridge feature. The presence of such broad bridge featuresuggests the onset of a collision between molecular components in the MCG35.2.A noticeable change in the H-band starlight mean polarization angles has alsobeen observed in the MCG35.2, probably tracing the interaction betweenmolecular components. Taken together, it seems that the cloud-cloud collisionprocess has influenced the birth of massive stars and YSOs clusters in theMCG35.2.

Star Formation Activity in the molecular cloud G35.20$-$0.74: onset of cloud-cloud collision