Day: July 10, 2023

1. For medicinal chemists, the classification of medications based on is the most useful.a) pharmacological effectb) molecular targetsc) chemical structured) drug action Answer: bExplanation: Medicinal chemists are interested in the site where a drug will take effect, and they prescribe specific drugs to people based on their needs. This also includes the structure-based mechanism of pharmacological action on the target. 2. Which of the following medications is not classified according to the pharmacological effect criteria?a) Analgesicsb) Antisepticsc) Antihistaminesd) Antipyretics Answer: cExplanation: The pharmacological effects of medications are a group of drugs that all have the same effect on a specific

1. Any substance made up of multiple repeating units called polymers is referred to as a polymer.a) Mersb) Plasticc) Resinsd) Blocks Answer: aExplanation: Any substance made up of multiple repeating units, known as mers, is referred to as a polymer. Polymers are made up of a large number of molecules connected together to form long chains. 2. Which of the following polymers does not fall within the configuration category?a) Cross-linkedb) Atacticc) Syndiotacticd) Isotactic Answer: aExplanation: The category of configuration does not include cross-linked polymers. The categories of configuration include syndiotactic, atactic, and isotactic. Within a macromolecule, tacticity refers to the

1. A disaccharide is formed when two monosaccharides are bonded together by a bond.a) glycosidicb) peptidec) ionicd) phosphodiester Answer: aExplanation: When two monosaccharide units come together, they lose a molecule of water and form an oxide bond. The glycosidic linkage is a bond formed by an oxygen atom between two monosaccharide molecules. 2. Sucrose is a _____ chemical, and the hydrolysis product combination is ______in nature.a) dextrorotatory; dextrorotatoryb) laevorotatory; laevorotatoryc) laevorotatory; dextrorotatoryd) dextrorotatory; laevorotatory Answer: dExplanation: Sucrose is a dextrorotatory sugar that produces a combination of dextrorotatory glucose and laevorotatory fructose when hydrolyzed. The resultant mixture is laevorotatory because the

1. What is the most basic aromatic amine’s common name?a) Benzenamineb) Benzylaminec) Anilined) Aminobenzene Answer: cExplanation: The simplest amine is aniline, which has the formula C6H5NH2. This name is also recognised by the IUPAC. The IUPAC designation for it is benzenamine, although it’s also known as aminobenzene. 2. What is the correct name for a molecule that has two amino groups in opposing (para) locations around a benzene ring?a) Benzenediamineb) Benzene-1,4-diaminec) p-Aminoanilined) 4-Aminobenzenamine Answer: bExplanation: Both amino groups (in para positions to one other) are given equal weight and the primary complex is given the prefix di. The prefix is

1. Which of the reactions below can result in ketones?a) Oxidation of primary alcoholsb) Oxidation of secondary alcoholsc) Dehydrogenation of tertiary alcoholsd) Dehydrogenation of primary alcohols Answer: bExplanation: Ketones are formed when secondary alcohols are oxidised and dehydrogenated. Aldehydes are produced by the same processes with primary alcohols. 2. The Rosenmund reaction can produce which of the following carbonyl compounds?a) Methanalb) Benzaldehydec) Butanoned) Acetone Answer: bExplanation: The Rosenmund reaction, which involves replacing chloride with hydrogen, is only utilised to make aldehydes. Methanal cannot be produced from this process because the acyl chloride that corresponds to it, formyl chloride, is unstable

1. To get carboxylic acids directly from alcohol, which of the following oxidising agents is used?a) Alkaline KMnO4b) Aqueous KMnO4c) Acidified KMnO4d) Anhydrous CrO3 Answer: cExplanation: Strong oxidizers, such as acidified potassium permanganate or acidified potassium dichromate, convert alcohol to carboxylic acid immediately. Using CrO3 as the oxidising agent in an anhydrous media, however, only aldehyde can be produced. 2. When phenol reacts with bromine water, what is the result?a) Brown liquidb) Colourless gasc) White precipitated) No reaction Answer: cExplanation: When phenol is treated with bromine water, a white precipitate is formed, which is 2,4,6-Tribromophenol. 3. The Lucas test was carried

1. What is the class of the substitution product of LiAlH4 and an alkyl halide reaction?a) Haloalkaneb) Alkyl nitritec) Nitroalkaned) Hydrocarbon Answer: dExplanation: The H atom in LiAlH4 acts as a nucleophile, attacking and substituting the halogen in the alkyl halide to generate the basic hydrocarbon. 2. Which of the following statements about SN2 mechanisms is incorrect?a) The transition state is stableb) The complete mechanism takes place in a single stepc) The rate of the reaction depends on the concentration of both reactantsd) There is an inversion of configuration Answer: aExplanation: The carbon atoms are concurrently attached to the entering nucleophile and the

1. A coordination complex’s core atom/ion is also known as ________a) Bronsted-Lowry acidb) Lewis basec) Lewis acidd) Bronsted-Lowry base Answer: cExplanation: A Lewis acid is a species that has the ability to receive an electron pair. Lewis acids are all cations. It is a Lewis acid because the core atom of a coordination complex is metal and always accepts electrons. 2. Which of the following has a coordination number as a feature?a) Coordination entityb) Ligandc) Central atomd) Coordination compound Answer: cExplanation: The coordination number of a central metal ion in a complex, also known as the secondary valency, is defined as the