144) The maximum number of −NO₂ groups that can be introduced by nitration in benzene is usually:

145) p−nitrobromobenzene can be converted to p−nitroaniline by using NaNH₂. The reaction proceeds through the intermediate:

146) An organic compound consumes 4 moles of periodic acid to form following compounds per mole of the starting compounds, HCHO, 3HCOOH and CHOCOOH. The organic compound is:

147) The ring structure of glucose is due to the formation of hemiacetal and ring formation between:

148) How many tripeptides can be prepared by linking the amino acids glycine, alanine and phenyl alanine?