Question

Lactic acid is called so because it is obtained from sour milk.
A. True
B. False

Answer 1

Hint: carboxylic acid is an organic acid that contain a carboxyl group $\left ({C\left ({= O} \right)OH} \right)$ attached to an R group for example fatty acid and amino acids contains carboxyl group. Lactic acid is an acid which contains carboxyl group and hydroxyl group. Lactic acid is a byproduct of anaerobic respiration-the process by which cells produce energy without oxygen.

Complete step by step answer:
We know the definition of carboxylic acid and what carboxylic acid. Carboxylic acid usually exists as dimer in non-polar media due to their tendency to self-associate. They have a high melting point because intermolecular hydrogen bonding occurs in carboxylic acid. Carboxylic acids are acids because they are proton donors.
The general formula of di carboxylic acid can be written as $H {O_2} C - R - C {O_2} H$ where R may be aliphatic or aromatic.
Now coming to the solution part, lactic acid is an organic acid having the molecular formula $C {H_3} CH\left ({OH} \right)COOH$. It is white solid and its form is a colorless solution in water. Lactic acid is alpha hydroxy acid due to the presence of hydroxyl group adjacent to carboxyl group. The conjugate base of lactic acid is called lactate .Lactic acid is chiral, consisting of two enantiomers. A mixture of these two in equal amounts is called D L lactic acid, or racemic lactic acid.
Swedish chemist Carl Wilhelm Scheele was the first person to isolate lactic acid. The term last means milk. It can be produced industrially by bacterial fermentation of carbohydrates mainly acetaldehyde.
It is a chemical byproduct of anaerobic respiration, the process cell produces energy y without oxygen bacteria produce it in yogurt. Bacteria present in buttermilk, yogurt use anaerobic respiration to break lilts milk sugar into lactic acid. Lactose dehydrogenase is the bacteria present in milk for producing lactic acid and given sour taste to milk.

So, the statement is true.

Note: Lactic acid is also present in blood, where it’s deposited by muscles and red blood cells. .Lactic acid is chiral, consisting of two enantiomers. A mixture of these two in equal amounts is called D L lactic acid, or racemic lactic acid. It is corrosive to metals and tissue.