how-the-following-compounds-can-be-differentiated-using-the-techniques-mentioned

Question

How can the following compounds be distinguished using only the techniques listed below and no other information?
a. using proton NMR spectroscopy
b. using ¹³C NMR with DEPT experiments.
c. using Infrared spectroscopy
Three chemical structures labeled I, II, and III for NMR and IR analysis in organic chemistry.

Accepted Answer

a. (I) sharp singlet δ 9-10, methyl protons δ 3.7-3.8
(II) broad singlet δ 10-14, methyl protons δ 2.4
(III) broad singlet δ 9-10, methyl protons δ 3.7-3.8
b. (I) C=O around δ 190
(II) and (III) C=O around δ 170
c. (I) C—H at 2710 cm⁻¹
(II) COOH from 2500-3500 cm⁻¹
(III) OH at 3100-3500 cm⁻¹

Answer

a. (I) broad triplet δ 9-10, methyl protons δ 3.7-3.8
(II) sharp singlet δ 10-14, methyl protons δ 2.4
(III) broad singlet δ 9-10, methyl protons δ 3.7-3.8
b. (I) C=O around δ 100
(II) and (III) C=O around δ 170
c. (I) C—H at 2710 cm⁻¹
(II) COOH from 2500-3500 cm⁻¹
(III) OH at 3100-3500 cm⁻¹

Answer

a. (I) broad singlet δ 9-10, methyl protons δ 1.7-1.8
(II) sharp doublet δ 10-14, methyl protons δ 2.4
(III) broad singlet δ 9-10, methyl protons δ 3.7-3.8
b. (I) C=O around δ 190
(II) and (III) C=O around δ 170
c. (I) C—H at 2500 cm⁻¹
(II) COOH from 2000-3000 cm⁻¹
(III) OH at 3100-3500 cm⁻¹

Answer

a. (I) sharp singlet δ 4-5, methyl protons δ 9.0-9.8
(II) broad singlet δ 7-8, methyl protons δ 2.4
(III) broad singlet δ 9-10, methyl protons δ 57-5.8
b. (I) C=O around δ 100
(II) and (III) C=O around δ 170
c. (I) C—H at 2710 cm⁻¹
(II) COOH from 1500-2500 cm⁻¹
(III) OH at 2100-2600 cm⁻¹

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How can the following compounds be distinguished using only the techniques listed below and no other information?
a. using proton NMR spectroscopy
b. using ¹³C NMR with DEPT experiments.
c. using Infrared spectroscopy