# Write down problem number. Provide formula, HDI value, and a complete, chemically correct structure for each...

###### Question:

1. Write down problem number.
1. Provide formula, HDI value, and a complete, chemically correct structure for each problem.
1. Assign signals in the 1H and 13C spectra to specific atoms, identify structural units and/or functional groups.

Example:

Problem  3

Formula: C8H8O2

HDI: 5

1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at 2.42 ppm, COOH proton at 12.9 ppm

13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3 at 21.40 ppm, 4 remaining signals are Ar carbons, two of which are quaternary, typical of a p-substituted ring

Structure:

CHO 35 3.50 -- --- ----- - -- ---3.60 6.68 7.40-17.30 - 7.20----- 7.10 --- 7.00--1-6.90--- 6.80 ---- 6.70T--- 6.60 7.35 7.16 7.37 7.5 7.0 6.0 3.5
130.87 116.24 2.24 9 171.00157.89 5.90 180 170 160 150 140 130 120 110 1 00 90 80 70 60 50 40 30

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