Question 51

The Correct Answer is B **Explanation for Option B (trichloromethane):** Chloroform is the common name for the chemical compound with the formula $\text{CHCl}_3$. Its systematic (IUPAC) chemical name is trichloromethane. The term "trichloromethane" directly describes the molecule: one carbon atom bonded to one hydrogen atom and three chlorine atoms. Therefore, trichloromethane is a scientific synonym for chloroform. **Why the other options are incorrect:** * **A) sulfuric chlorohydrin:** This is not a standard chemical compound and does not match the formula or structure of chloroform ($\text{CHCl}_3$). The components suggest a mixture or reaction product involving sulfur, chlorine, and water-like components, which is chemically distinct from chloroform. * **C) chlorine gas:** Chlorine gas is $\text{Cl}_2$. It is an elemental diatomic gas used as a disinfectant and industrial reagent, but it is structurally and chemically very different from chloroform ($\text{CHCl}_3$). * **D) 4-methyl phenol:** This compound is an organic aromatic alcohol (specifically, an isomer of cresol), with the formula $\text{C}_7\text{H}_8\text{O}$. It is used in antiseptics and disinfectants but bears no chemical resemblance to chloroform ($\text{CHCl}_3$), which is a simple halomethane.