Please provide the correct answer for each and an explanation for why each answe

Question

Please provide the correct answer for each and an explanation for why each answer is correct

What IR absorption bands are consistent with this structure? a. 3100, 1700, 3300 cm^-1 b. 3300, 3050, 2900 cm^-1 c. 3300, 1700, 750 cm^-1 d. 3300, 2900, 2250 cm^-1 e. 3100, 2250, 1700 cm^-1 Which of the following molecules will have no 1R bands at frequencies greater than 3000 cm^-1? a. CH_3COOH b. CH_2 = CHCH_3 c. CH_3CH_2OH d. CH_3CH_2NH_2 e. CH_3OCH_3 Which of the following IR bands would you not expect to find m caffeine? a. 3400 cm^-1 b. 1710 cm^-1 c. 1650 cm^-1 d. 3 100 cm^-1 e. 2950 cm^-1

Explanation / Answer

25. Answer is option b.

OH stretching at 3300 cm-1

=C-H stretching at 3050 cm-1

Alkane C-H stretching at 2900 cm-1

26. Answer is option e.

Dimethyl ether will not have frequency above 3000 cm-1

Where option will have above 3000 cm-1 due to acid group

Option b will have above 3000 cm-1 due to alkene CH streaching

Option c will have above 3000 cm-1 due to OH streaching

Option d will have above 3000 cm-1 due to NH2 stretching

27. 1710 cm-1 due carbonyl group

1650 cm-1 due to conjugated carbonyl group

2950 cm-1 due to CH stretching of methyl group

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