Question

Hi! Could you help me answer number 3,4 and 5 please? The first picture is the experiment result, the second picture is the unknowns option, and the third picture is the questions

Title: Unknown #1-Section C 100 Fri May 06 10:23:14 2016 (G 90 80 70 60 50 40 4000 3500 3000 2500 2000 1500 1000 No search results for the selected spectrum! Collection time: Fri May 06 10 20 34 2016 (GMT-07 Fn May 6 10 22 38 2016 (GMT-07 Regon 4000 12 580 10 Postion1345

Answer 1

3. according to the above gragh , by observing the ir spectum graph , the belongs to a compond cyclohexanol (it spetum  broad OH band near 3600-3300 cm^-1 )

4 and5. answer

from the following information yoy may identify the unknown compounds by their funtional groups of a compoundor

1. for the carbonyl C::O band. a strong band at 1820-1660 cm-1. This band is usually the most intense absorption band in a spectrum. It will have a medium width. If you see the carbonyl band, for other bands associated with functional groups that contain the carbonyl by going to step 2. If no C::O band is present, check for alcohols and go to step 3.

2. If a C::O is present you want to determine if it is part of an acid, an ester, or an aldehyde or ketone. At this time you may not be able to distinguish aldehyde from ketone and you will not be asked to do so.

ACID	for indications that an O-H is also present. It has a broad absorption near 3300-2500 cm-1. This actually will overlap the C-H stretch. There will also be a C-O single bond band near 1100-1300 cm-1. for the carbonyl band near 1725-1700 cm-1.
ESTER	the C-O absorption of medium intensity near 1300-1000 cm-1. There will be no O-H band.
ALDEHYDE	for aldehyde type C-H absorption bands. These are two weak absorptions to the right of the C-H stretch near 2850 cm-1 and 2750 cm-1 and are caused by the C-H bond that is part of the CHO aldehyde functional group. for the carbonyl band around 1740-1720 cm-1.
KETONE	The weak aldehyde CH absorption bands will be absent. for the carbonyl CO band around 1725-1705 cm-1.

3. If no carbonyl band appears in the spectrum, for an alcohol O-H band.

ALCOHOL

for the broad OH band near 3600-3300 cm-1 and a C-O absorption band near 1300-1000 cm-1.

4. If no carbonyl bands and no O-H bands are in the spectrum, check for double bonds, C::C, from an aromatic or an alkene.

ALKENE	for weak absorption near 1650 cm-1 for a double bond. There will be a CH stretch band near 3000 cm-1.
AROMATIC	the benzene, C::C, double bonds which appear as medium to strong absorptions in the region 1650-1450 cm-1. The CH stretch band is much weaker than in alkenes.

5. If none of the previous groups can be identified, you may have an alkane.

ALKANE	The main absorption will be the C-H stretch near 3000 cm-1. The spectrum will be simple with another band near 1450 cm-1.

6. If the spectrum still cannot be assigned you may have an alkyl bromide.

ALKYL BROMIDE

for the C-H stretch and a relatively simple spectrum with an absorption to the right of 667 cm-1.