One of the following RNAs is not involved in protein synthesis.
snRNA or smaller nuclear RNA is involved in the processing of hnRNA into active mRNA but not in the formation of protein during translation.
rRNA acts as peptidyl transferase and also in correctly aligning the ribosome at the end of UTR I of mRNA.
tRNA brings the amino acids on to the surface of ribosome and decodes the information present on mRNA.
mRNA acts as template for the formation of protein on the surface of ribosome.