Question

Glycine is the simplest of the amino acids, has the formula, CH2 (NH2) COOH and the Lewis structure.

a. Write the VSEPR formula for the nitrogen atom as the central atom in glycine.
b. Based on VSEPR theory, what is the approximate C-N-H bond angle in glycine? Explain.
c. What is the approximate O-C-O bond angle in glycine? Explain.
d. Identify at least two absorption bands ( and corresponding cm-1) that would likely appear in the infrared spectrum of glycine.

Answer 1

Acc to VESPER they if no. of lone pairs - 3 no. of lone pairs - 1 the land angle should 107 degree and shape is go pylaudal Acc to VESPER there if no of bond pairs - 3 no of lone pairs - 0 the land angle should be 120 degree and shape is go an places IR spectrum N - h street cleaning alpha 3300 cm ^-1 c = 0 strecting alpha 1650 cm ^-1

Answer 2

Answer 3

a) 

AX3

b) 

<109.5 (tetrahedral electron pairs, including bonding andnonbonding pairs). But it should be around 107 (like inammonia)

c) 

120, sp2 hybridized

d)

carboxylic acid :   1710 cm-1

primary amine:    3400–3500cm−1

Answer 4

2 amino -3- hydroxy propanoicacid