2. This question continues on the next two pages. The compounds that gave each o

Question

2. This question continues on the next two pages. The compounds that gave each of the following IR spectra contain a carbonyl. Some of them also contain an aromatic ring and/or an alkene. Some of the compounds may contain more than one type of carbonyl or CEC (1 pt per spectrum 4 pts) a. Below each spectrum indicate whether the compound contains an aldehyde, 1 amide, 2e amide, carboxylic acid, ester, ketone, or strained cyclic ketone. b. Below each spectrum indicate whether the compound contains an aromatic ring, an alkene, both or neither. Spectrum A: 800 3362 1411676 g90 471 3179 23 1613 4 962 26 105 5 430 840 86 034 72 1363 9 819 62 2791 84 1130 47 64 58 1921 84 11062 7. | 610 62 Type of Cop Type of C:C:

Explanation / Answer

Spectrum 1:

Types of C=O

In this spectrum 10 amide is present ==> 3362 & 3179 these two consecutive peaks are due to N-H bond stretching.

Types of C=C

Aromatic ring is present ==> 1613 & 1430 these two consecutive peaks are only observed in case of aromatic ring, basically if aromatic ring is present then due to C=C stretching one peak comes at higher than 1400 and one higher than 1600 cm-1.

Spectrum 2:

Type of C=O

Aldehyde is present ==> peaks at 3436 & 2963 cm-1 represents that, C-H stretching

again peak at 1727 represents the carbonyl C=O stretching

Type of C=C

peak at 3436 represents sp2 C-H stretching

Here alkene is present

Spectrum 3:

type of C=O

ketone due to the peak at 1683

alkene is present due to the peak at 3063 (sp2)

it is an conjuated ketone

Spectrum 4:

type of C=O

acid is present

alkene is present... it is a conjugated acid

Do let me know if you have any doubts in comment :)

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