This question should be answered by considering the reactions of KMnO4 with different functional
groups under the stated conditions.
The diagram attached shows the structure of the naturally-occurring molecule cholesterol.
cholesterol
Separate oxidation reactions are carried out using different conditions.
● cold, dilute acidified KMnO4
● hot, concentrated acidified KMnO4
Which statements about the products formed are correct?
cold, dilute acidified KMnO4: hot, concentrated acidified KMnO4:
number of hydroxy groups number of 6-membered rings
present remaining
A 1 2
B 1 3
C 3 2
D 3 3
Answers
Potassium permanganate. Potassium permanganate (KMnO4) is a very strong oxidant able to react with many functional groups, such as secondary alcohols, 1,2-diols, aldehydes, alkenes, oximes, sulfides and thiols.
Cholesterol (from the Ancient Greek chole- (bile) and stereos (solid), followed by the chemical suffix -ol for an alcohol) is an organic molecule. It is a sterol (or modified steroid),[5] a type of lipid molecule, and is biosynthesized by all animal cells, because it is an essential structural component of all animal cell membranes.
In addition to its importance for animal cell structure, cholesterol also serves as a precursor for the biosynthesis of steroid hormones, bile acid[6] and vitamin D. Cholesterol is the principal sterol synthesized by all animals. In vertebrates, hepatic cells typically produce the greatest amounts. It is absent among prokaryotes (bacteria and archaea), although there are some exceptions, such as Mycoplasma, which require cholesterol for growth.[7]
François Poulletier de la Salle first identified cholesterol in solid form in gallstones in 1769. However, it was not until 1815 that chemist Michel Eugène Chevreul named the compound "cholesterine"
When iron reacts with oxygen it forms a chemical called rust because it has been oxidized (The iron has lost some electrons.) and the oxygen has been reduced (The oxygen has gained some electrons.). Oxidation is the opposite of reduction. A reduction-reaction always comes together with an oxidation-reaction.
Oxidation of alkenes with hot concentrated acidified potassium manganate(VII) solution. ... That means that the reaction will not stop at this point unless the potassium manganate(VII) solution is very dilute, very cold, and preferably not under acidic conditions.
Oxidation of alkenes with hot concentrated acidified potassium manganate(VII) solution. The diols, such as ethane-1,2-diol, which are the products of the reaction with cold dilute potassium manganate(VII), are themselves quite easily oxidized by manganate(VII) ions.