Chemistry 9701: NITROGEN COMPOUNDS Topical Past Paper Questions

(a) Using a gel buffered at pH 7.6, electrophoresis is performed on a mixture of three amino acids: asparagine, histidine and lysine. Figure 9.1 The isoelectric points of these amino acids are given in Table 9.1. Table 9.1 Describe the direction of movement of each amino acid dur…

(a) Explain why amides are much weaker bases than amines. [2] (b) Fig. 9.1 shows the preparation of 2-phenylethylamine, $ C_{6}H_{5}CH_{2}CH_{2}NH_{2} $, by three different routes. Fig. 9.1 (i) Suggest structures for compounds M and N and draw them in the boxes in Fig. 9.1. [2] (…

Amino acids are molecules that contain —NH_{2} and —COOH functional groups. Glycine, $ H_{2}NCH_{2}COOH $, is the simplest stable amino acid. (a) The isoelectric point of glycine is 6.2. (i) Define isoelectric point. [1] (ii) Draw the structure of glycine at pH4. (b) Fig. 6.1 sho…