Why does the melting point (70-71) above match neither the enantiomers’ nor the racemate’s? Does it mean that the substance is impure, or perhaps isn’t even ibuprofen at all? (Racemic mixture:75-77C, Enantiomer:52-53C) The image shows the chemical structure of Ibuprofen. ### Structural Description:- **Benzene Ring:** The central feature of the structure is a benzene ring, which is a six-carbon ring with alternating double bonds, indicating aromaticity.- **Isobutyl Group:** Attached to the benzene ring is an isobutyl group (a three-carbon chain with the formula CH(CH3)2), connected through a single bond.- **Propionic Acid Group:** On the opposite side of the benzene ring, another side chain is attached, which includes a propionic acid moiety: - **Methine (CH):** The first carbon of this chain is a methine group (CH connected to CH3). - **Carboxylic Acid Group:** This is represented as -COOH, indicating a carbon double-bonded to an oxygen (C=O) and single-bonded to a hydroxyl group (OH).### Notations:- **CH3:** Methyl group.- **OH:** Hydroxyl group.- **O:** Oxygen in the carboxylic acid group.This structure represents the active ingredient in many over-the-counter pain relief medications known as Ibuprofen, commonly used for reducing pain, fever, and inflammation.

To determine the purity of ibuprofen using melting point.The ibuprofen has one chiral center, hence there are two enentiomers when these enantiomer are present in equal amount the the mixture is called racemic mixture. The melting point of racemic mixture (equal amount of enantiomer) is 75-77 Co. When the mixture of enantiomer present in unequalamount then the melting point of the compound can be below or above the melting point of pure enantiomer. So the melting point of compound observed is 71 Co. That means the compound obtained is not pure enantiomer or the racemic mixture instead of it contains unequal amount of enantiomers. So the compound obtained is ibuprofen but having unequal amount of enantiomer.