Question

IDENTIFICATION of an UNKNOWN ORGANIC COMPOUND PRE LAB QUESTIONS DATE NAME 1. Circle AND name four different functional groups in the compound to the right Macrocyclic lactone ring н сн N сн но. Нас Cн, O HO -O -он CH3 Hyc-OH CH3 Cн HyC OCH OH CH CH3 "сна 2. You have an unknown containing five carbon atoms, has a pH of 6, yields a yellow solution having no precipitate in a 2,4-DNP test, and produces a Jell-O like blue-green solution in a chromic acid test. Name ONE functional group your unknown could contain. ons for 3. You tested around 20 compounds containing 10 different functional groups in the Chemical Reactions of Select Functional Groups lab. Five of those functional groups also contain a carbonyl group. List the five functional groups that contain a carbonyl group. 4. Two of the compounds you tested in the Chemical Reactions of Select Functional Groups lab were initially insoluble, but became more soluble after neutralization, either by adding acid or base. Which compound became more soluble after acid was added? Which compound became more soluble after base was added? 75

Answer 1

- amine (textiary DH Gether. Hic Holt a kchol ketone. 2A] The unknown could contain aldehyde functional gray since in 2,4-DNP test only aldehydes. and ketones xact. They react with 24 PNP reagent to foom yellow, oragne or reddish-orange. Precipitates, whereas alohols do not react. The choomic acid test uses the Jones reactant to oxidize aldehydes and alcholas and reduce the chromic acid, resulting in color o change. It is able. to identify aldehydes, primary alchol and secondary alchol- it can't identify tertiary alchole In both tests aldehydes gave positive - so, the unknown (oluld contain aldehyde functional gaur 34. Cartony) group, in organic chemistry, a divalent. Chemical unit consisting of a Carton (c) and an oxygen(o) atom connected by a double bond

that contain a List of five functional groups Cartonyl group are 1) aldehyde (-CHO) 2) ketone (-con) 3) Carbarylic acid (-Cont) 4) ester (-CO, RJ 5) Amide (-CONH₂) 4) Amines become more soluble after acid was added. Amines RN react with strong acids such as hydociodic acid (HT), Hydroboomi acid (HB). and hydrochlosic acid(fic) to give ammonium salts (R ₂ WH I J which are more soluble in water Cas bolylic acids becomes more soluble after. base was added. The cas basylic acid group contain a co with an additional Oft group attached to ab the Caston. When carboxylic acids are treated with mineral bases such as sodium hydroxide (Naott), the se Carboxylic OH group gives up a proton to the hydroxide, forming a water molecule. The elections in the O-H bond stay behind & Putting a negative charge on the resulting Carboxylate anion. The. salt that forms is much more water soluble. S