Chemistry in Every Day Life

Para-aminobenzenesulphonamide (sulphanilamide) is a sulfa drug that acts as an antimetabolite. It competes with para-aminobenzoic acid (PABA), which bacteria need to synthesize folic acid. By mimicking PABA structure, it disrupts bacterial folate synthesis, killing the bacteria. PABA itself is not an antimetabolite - it's the metabolite bacteria actually need.

Ampicillin is a narrow-spectrum penicillin antibiotic effective mainly against Gram-positive bacteria. Broad-spectrum antibiotics like Tetracycline, Chloramphenicol, and Fluoroquinolones work against both Gram-positive and Gram-negative bacteria. The question identifies the one that is NOT broad-spectrum.

Chloromycetin (chloramphenicol) is an antibiotic that inhibits bacterial protein synthesis. Aspirin and Brufen are analgesics/anti-inflammatory drugs, not antibiotics. Chloroquine is an antimalarial drug. Only Chloromycetin among the options is actually an antibiotic.

Veronal (barbital) is a barbiturate drug that acts as a sedative, depressing the central nervous system to produce calming effects and induce sleep. It is not an anesthetic (which causes complete loss of sensation), antiseptic (which kills microbes), or antihistaminic (which blocks histamine receptors).

Equanil (meprobamate) is a tranquilizer/sedative used to treat anxiety and tension. BHC, DDT, and Malathion are all pesticides used to kill insects and other pests. The question asks which is NOT a pesticide, making Equanil the correct answer.

Acetoxybenzoic acid is the chemical name for aspirin (acetylsalicylic acid), a widely used analgesic, antipyretic, and anti-inflammatory drug.

Chloroquine is a well-known antimalarial medication that works by interfering with the parasite's ability to digest hemoglobin in red blood cells.

Paracetamol (acetaminophen) is primarily used as an antipyretic to reduce fever and as a mild analgesic for pain relief. Unlike quinine (antimalarial), luminal (barbiturate sedative), or paprazine, paracetamol directly reduces fever.

Ampicillin is a semi-synthetic penicillin derivative, not a natural antibiotic. Natural penicillins (like penicillin G and V) are produced directly by Penicillium mold, while ampicillin is chemically modified.

Aspirin is primarily used as an analgesic (pain reliever) and antipyretic (fever reducer), not as an antibiotic, antiseptic, or antimalarial.

DDT (Dichlorodiphenyltrichloroethane) is a synthetic insecticide used to control mosquitoes and other insect populations, not fungi, weeds, or pain.

Chloramphenicol is a broad-spectrum antibiotic effective against Salmonella typhi, the bacteria that causes typhoid fever, though its use is now restricted due to serious side effects like aplastic anemia.

Direct dyes are applied to fiber from an aqueous solution in the presence of electrolytes without the need for a mordant. Martius yellow (also called Acid Yellow 32) is a direct dye that binds directly to cellulose fibers through van der Waals forces and hydrogen bonding. Aniline yellow is an azo dye, Malachite green is a basic (cationic) dye, and 'All of these' is incorrect because they belong to different dye classes.

Azo dyes contain one or more azo groups (-N=N-) as the chromophore. Methyl orange (sodium 4-[(4-dimethylamino)phenylazo]benzenesulfonate) contains a characteristic azo linkage between aromatic rings, making it a classic example of an azo dye used as a pH indicator. Alizarin is an anthraquinone dye, Indigo is a vat dye, and Martius yellow is an azo dye but less commonly cited as the example.

Basic dyes are cationic dyes that contain amino or substituted amino groups which become positively charged in solution. Malachite green (Basic Green 4) is a triphenylmethane dye with dimethylamino groups that carry a positive charge, allowing it to bind to negatively charged surfaces like acrylic fibers and biological tissues for staining. Martius yellow is an acid dye, Alizarin is a mordant dye, and Phenolphthalein is a pH indicator.

Equanil (meprobamate) has the chemical formula C4H12CaN2O4 as the calcium salt, containing Carbon, Hydrogen, Oxygen, and Nitrogen. The presence of nitrogen is indicated by the 'amate' suffix (carbamate). Carbon and Hydrogen alone (A) is insufficient, C-H-O (B) lacks the nitrogen, and C-H-O-N-S (D) incorrectly adds sulfur.

Basic dyes contain amino groups (-NH2) or substituted amino groups that can accept a proton to become positively charged cations in solution. The -NMe2 (dimethylamino) group is characteristic of basic dyes like malachite green, crystal violet, and methylene blue, which carry a positive charge and bind to negatively charged substrates. Hydroxyl (-OH) and nitro (-NO2) groups are found in acid and mordant dyes, while -SO3Na (sulfonate) creates water-soluble acid dyes.

Auromycin (chlortetracycline) is a tetracycline-class antibiotic effective against both Gram-positive and Gram-negative bacteria, making it broad-spectrum. Penicillin G and Benzyl penicillin are narrow-spectrum, primarily effective against Gram-positive bacteria. Salicylamide is not an antibiotic but a non-steroidal anti-inflammatory drug derivative.