Question

33) What is the overall charge of the amino acid, alanine, at pH 10? 33) B)-1 D) No overall charge 34) As applied to the chemistry of amino acids, what is the definition for the isoelectric 34) point? A) The pH at which the amino acid exists primarily in its neutral form. B) The pH at which the amino acid exists primarily in its acidic form. C) The pH at which the amino acid exists as a mixture of isomers. D) The pH at which the amino acid exists primarily in its basic form. 35) 35) Which of the following compounds is least basic? C) III D) IV A) I B) ? 36 36) What is the IUPAC name for the following compound? ok A) Tert-butyl aldehyde C) Pivaldehyde B) 2,2-Dimethylpentanal D) 2.2-Dimethylpropanal 37) 37) What is the structure of 2-trifluoromethyl-2-methoxybutanal? CF3 CF3 MeO O D) IV A) I 38) 38) Using IR spectroscopy, how can you tell the difference between a ketone and an aldehyde? A) A ketone has no C-H stretches. B) A ketone has no carbonyl stretch at 1720 cm1. C))An aldehyde has two C-H stretches between 2700-2850 cm-1, D) An aldehyde has a carbonyl stretch at 1820 cm-1, 10

Answer 1

pH = 10 NH2 c- -chae) .. . option ③ is corre ct BC-) 34- →-: ie pH at olach amino acids exists Pinang ,n its neutral form