How many \"types\" of hydrogens are in the following molecule? (How many of sets

Question

How many "types" of hydrogens are in the following molecule? (How many of sets of signals would you expect to observe in their ^1H-NMR species? A compound with formula C_2H_6O has an infrared absorption at 3200-3500 cm1 Draw the structure of the compound. A compound with formula C_2H_6O has an infrared absorption at 1750 cm - A signal at 9.0 ppm appears in the ^1H-NMR spectrum. Draw the structure of the compound. Which compound with formula C_2H_6O has an infrared absorption AT 1750 CM^-1. A signal at 9.ppm appears in the ^1H-NMR spectrum? CH3CH2CH2-Br Br-CH2CH2CH?-Br Br Br CH3CH2CCH3 CH3CH2CHCH2CH3

Explanation / Answer

14: (a) Mesitylene has 2 different types of H atoms and has 2 different types of signals are observed.

(b) butan-2-one has 3 different types of H atoms and has 3 different types of signals are observed.

(c) 1,1,-dimethylcyclopropane has 2 different types of H atoms and has 2 different types of signals are observed.

(d) propene has 3 different types of H atoms and has 3 different types of signals are observed

15:  An infrared absorption peak in the range 3200 - 3500 cm-1 conforms the presence of a hydrogen bonded - O - H, hydrogen atom(-OH group). Hence the compound is a alcohol(CH3CH2OH) and the structure is

CH3 - CH2 - OH

16. An infrared absorption peak at 1750 cm-1 conforms the presence of a carbonyl group (-C=O). A signal at 9.0 ppm in 1H NMR spectrum conforms the presence of aldehyde hydrogen(CHO). Hence the compund is an aldehyde(CH3CH2CHO) and the structure is

CH3 - CH2 - C(=O)H

17.The organic compound represented by (c) will have a singlet. This is due to the absence of H - atom on the 2nd C - atom, the hydrogens on the 1st C - atom will form singlet.

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