1.Conjugation of the functional group in alkyl isocyanates has little impact on the antisymmetric stretching vibration located near 2770 cm^–1 Explain.

2.In the infrared spectrum of 2-aminoanthraquinone (I) two carbonyl stretching frequencies are observed at 1673.5 and 1625 cm^–1 :

(a) Assign carbonyl bands in the infrared spectrum to the carbonyl groups in structure I and explain your reasoning

(b) The infrared spectrum of 1-hydroxyanthraquinone (II) also exhibits two carbonyl frequencies, which are located at 1675 and 1637 cm^–1 . Assign the carbonyl groups to the related absorption bands. Explain your reasoning.

(c) The spectrum of 2-hydroxyanthraquinone exhibits a single carbonyl stretching frequency near 1673 cm^–1 . Explain why a single carbonyl band would be expected in the system and why this vibration is located at 1673 cm^–1 .