Drugs and Medicines Questions in English

(A) Aminoglycosides are a class of compounds that act as potent $antibiotics$. They are effective against Gram-negative bacteria and are among the oldest classes of antibiotics used in clinical practice.

(D) Aspirin is a non-narcotic analgesic,not a narcotic analgesic. It is used to relieve pain and reduce fever,and it also has anti-blood clotting properties.

(B) The term "antihistamine" refers specifically to $H_1$ antagonists,which are also known as $H_1-$receptor antagonists or $H_1-$antihistamines.
These drugs are used to treat symptoms of allergies by blocking the action of histamine at the $H_1$ receptor sites.

(C) Antifertility drugs are chemical compounds that prevent pregnancy in women.
These drugs control the menstrual cycle and ovulation and are used as birth control drugs or contraceptives.
$Saheli$ is a well-known non-steroidal oral contraceptive pill used as an antifertility drug.

(C) Heroin is a semi-synthetic opioid drug synthesized from morphine.
Chemically,it is known as $3,6$-diacetylmorphine or morphine diacetate.
It is produced by the acetylation of morphine with acetic anhydride.

(C) Sulphonamides are a group of synthetic drugs that contain the sulphonamide group. They are widely used as antimicrobial agents because they inhibit the growth of bacteria by interfering with the synthesis of folic acid in them.

(C) Chloroxylenol is a phenol derivative,so it gives a positive Ferric chloride test $(r)$.
$(b)$ Norethindrone contains a carbon-carbon triple bond (alkyne),so it gives a positive Bayer's test $(s)$.
$(c)$ Sulpha pyridine contains a primary amine group $(-NH_2)$,so it gives a positive Carbylamine test $(p)$.
$(d)$ Penicillin contains a carboxylic acid group $(-COOH)$,so it gives a positive Sodium hydrogen carbonate test $(q)$.
Thus,the correct match is $a \to r, b \to s, c \to p, d \to q$.

(A) The correct matches are as follows:
$a.$ Norethindrone is an anti-fertility drug $(q)$.
$b.$ Ofloxacin is an anti-biotic $(p)$.
$c.$ Equanil is a tranquilizer used for hypertension or stress $(r)$.
Therefore,the correct sequence is $a-q, b-p, c-r$.

(A) Noradrenaline is an organic chemical in the catecholamine family that functions in the brain and body as a hormone and a neurotransmitter.

(A) . Noradrenaline is a neurotransmitter $(ii)$.
$B$. Barbiturates are used as tranquilizers and act as hypnotics $(v)$.
$C$. Bromopheniramine is an antihistamine $(iv)$.
$D$. Penicillin-$G$ is a narrow spectrum antibiotic $(iii)$.
Therefore,the correct matching is $A-ii, B-v, C-iv, D-iii$.

(D) $Aspirin$ $(acetylsalicylic \ acid)$ is a well-known drug that acts as an analgesic to relieve pain.
It also possesses anti-blood clotting properties,which is why it is often used in the prevention of heart attacks.
It is classified as a neurologically active drug because it acts on the nervous system to reduce pain and inflammation.
Therefore,all the given statements are correct.

(B) Aspirin $(acetylsalicylic \ acid)$ is a well-known drug that acts as both an analgesic (pain reliever) and an antipyretic (fever reducer).
It works by inhibiting the synthesis of prostaglandins,which are chemicals in the body that signal pain and fever.
Therefore,the correct classification for aspirin among the given options is an antipyretic.

(D) Ranitidine is a histamine $H_2$-receptor antagonist. It works by reducing the amount of acid produced in the stomach. Therefore,it is classified as an antacid.

(D) Antibiotics are classified as bactericidal or bacteriostatic based on their action against bacteria.
Bactericidal antibiotics kill the bacteria (e.g.,Penicillin,Aminoglycosides,Ofloxacin).
Bacteriostatic antibiotics inhibit the growth of bacteria (e.g.,Tetracycline,Chloramphenicol,Erythromycin).
Therefore,Tetracycline is a bacteriostatic antibiotic,not a bactericidal one.

(C) Aspirin (acetylsalicylic acid) acts as an anti-platelet agent.
It inhibits the aggregation of platelets in the blood,which prevents the formation of blood clots.
This anti-blood clotting action is the primary reason it is prescribed to prevent heart attacks.

(A) Narcotic analgesics are drugs that relieve pain and produce sleep. When administered in medicinal doses,these relieve pain and produce sleep. In poisonous doses,they produce stupor,coma,convulsions,and ultimately death. Morphine and many of its homologues are narcotic analgesics. Heroin and Codeine are derivatives of Morphine. Therefore,$Morphine$,$Heroin$,and $Codeine$ are classified as narcotic analgesics.

(A) Antibiotics are classified based on the range of microorganisms they affect.
Narrow spectrum antibiotics are active against either a specific group of gram-positive bacteria or a specific group of gram-negative bacteria.
Broad spectrum antibiotics are active against a wide range of both gram-positive and gram-negative bacteria.
Therefore,a narrow spectrum antibiotic is active against a specific group of bacteria,which can be either gram-positive or gram-negative.

(D) Analgesics are medicines that reduce or abolish pain without causing impairment of consciousness,mental confusion,incoordination,or paralysis.
They are classified into two categories:
$(i)$ Non-narcotic (non-addictive) analgesics: These include drugs like Aspirin,Ibuprofen,and Paracetamol.
$(ii)$ Narcotic analgesics: These are addictive drugs that,when administered in medicinal doses,relieve pain and produce sleep. Examples include Morphine,Heroin,and Codeine.
Therefore,Morphine is a narcotic analgesic.

(C) Cationic detergents are quaternary ammonium salts of amines with chlorides,bromides,or acetates as anions.
The cationic part possesses a long hydrocarbon chain and a positive charge on the nitrogen atom.
Cetyltrimethylammonium chloride is a common example: $[CH_3-(CH_2)_{15}-N(CH_3)_3]^+Cl^-$.

(C) An antibiotic is a chemical substance produced by microorganisms that can inhibit the growth of or destroy other microorganisms.
$Chloromycetin$ (also known as $Chloramphenicol$) is a broad-spectrum antibiotic used to treat various bacterial infections.
$Aspirin$ is an analgesic and antipyretic.
$Brufen$ (Ibuprofen) is an analgesic and anti-inflammatory drug.
$Chloroquine$ is an antimalarial drug.
Therefore,the correct option is $C$.

(B) Aspirin (acetylsalicylic acid) is a well-known drug that functions as an $analgesic$ (to relieve pain) and an $antipyretic$ (to reduce fever). Therefore,the correct option is $B$.

(A) Tobacco leaves contain an alkaloid known as $Nicotine$.
$Nicotine$ is a highly addictive and harmful chemical substance that acts as a stimulant in the human body.

(D) Antifertility drugs are chemical substances used to control the birth rate or prevent pregnancy.
$Norethindrone$ is a synthetic progesterone derivative that acts as an antifertility drug.
$Terpinol$ is an antiseptic,$Salvarsan$ is an antibiotic,and $Chloramphenicol$ is a broad-spectrum antibiotic.

(C) The structure shown is $2$-acetoxybenzoic acid,commonly known as aspirin.
It is a well-known drug that acts as an analgesic (pain reliever) and antipyretic (fever reducer).
Therefore,the correct option is $C$.

(D) Penicillin is a group of antibiotics derived from Penicillium fungi. It is used to treat various bacterial infections by inhibiting the synthesis of the bacterial cell wall. Therefore,it is classified as an antibiotic.

(A) $CFCs$ (Chlorofluorocarbons) are known to deplete the ozone layer.
To mitigate this environmental impact,$1,1,1,2-$ Tetrafluoroethane,commonly known as $HFC-134a$,is used as a refrigerant.
It does not contain chlorine atoms,which are responsible for ozone depletion,making it a more environmentally friendly alternative.

(A) Chloramphenicol is a broad-spectrum antibiotic,not a narrow-spectrum antibiotic. Therefore,the statement in option $A$ is incorrect. Chlordiazepoxide is a mild tranquilizer used for the relief of tension,which is correct. Brompheniramine is an antihistamine,which is also correct. Since option $A$ is incorrect,the correct answer is $A$.

(D) Barbiturates are a class of drugs that act as central nervous system depressants and are used as sedatives or hypnotics. $Veronal$,$Luminal$ (phenobarbital),and $Seconal$ are all well-known examples of barbiturate derivatives. Therefore,all the given options are barbiturates.

(A) Chloramphenicol is a well-known $ \text{broad-spectrum antibiotic} $.
It is effective against a wide range of Gram-positive and Gram-negative bacteria.
It is used to treat various serious infections such as typhoid,dysentery,and acute fever.

(D) ,$B$,and $C$ are correctly matched.
$Sorbic$ $acid$ is a food preservative.
$Sodium$ $stearate$ is a common soap.
$Alitame$ is an artificial sweetener.
$Sodium$ $benzoate$ is widely used as a food preservative,not as a detergent.
Therefore,$D$ is the incorrectly matched pair.

(A) Salvarsan is an arsenic-based compound,specifically $3,3'-diamino-4,4'-dihydroxyarsenobenzene$.
It was one of the first effective treatments for syphilis.
In modern classification,it is considered an early form of an antibiotic or antimicrobial agent used to treat bacterial infections.

(A) Antacids are substances that neutralize excess stomach acid.
$Cimetidine$ (Tegamet) and $Ranitidine$ (Zantac) are well-known antacids that work by preventing the interaction of histamine with the receptors present in the stomach wall.
$Histamine$ is a chemical messenger that stimulates the secretion of pepsin and hydrochloric acid in the stomach,but it is not an antacid itself.
Therefore,$Histamine$ is the correct answer.

(B) Heroin,also known as diacetylmorphine,is a semi-synthetic opioid drug. It is produced by the acetylation of $Morphine$.

(D) Ofloxacin is a synthetic chemotherapeutic agent of the fluoroquinolone drug class. It is widely used as an $Antibiotic$ to treat various bacterial infections.

(B) Tincture of iodine is a well-known antiseptic solution.
It is prepared by dissolving $2-7 \%$ of iodine $(I_2)$ in a mixture of alcohol and water.
Therefore,it is defined as an alcoholic solution of $I_2$.

(A) Dettol is a mixture of chloroxylenol and terpineol,which acts as an antiseptic. Antiseptics are applied to living tissues to prevent or destroy the growth of microorganisms.

(A) Penicillin $G$ is a natural antibiotic that is effective mainly against Gram-positive bacteria.
Antibiotics that are effective mainly against Gram-positive or Gram-negative bacteria are referred to as narrow spectrum antibiotics.
Therefore,Penicillin $G$ is classified as a narrow spectrum antibiotic.

(D) $Aspirin$ $(2-acetoxybenzoic \ acid)$ is a well-known drug that acts as an analgesic to relieve pain.
It also possesses anti-blood clotting properties,which is why it is often used in the prevention of heart attacks.
It is classified as a neurologically active drug because it affects the nervous system to reduce pain and inflammation.
Therefore,all the given statements are correct.

(C) Iodine is commonly used as an antiseptic in the form of a tincture of iodine,which is a $2-3 \%$ solution of $I_2$ in alcohol-water mixture. Its antiseptic action is primarily due to the slow liberation of free iodine,which acts as a strong oxidizing agent and kills microorganisms.

(A) Antibiotics are classified based on the range of bacteria they target.
$1$. Narrow spectrum antibiotics are effective against either gram-positive or gram-negative bacteria.
$2$. Broad spectrum antibiotics are effective against a wide range of gram-positive and gram-negative bacteria.
Therefore,a narrow spectrum antibiotic is active against either gram-positive or gram-negative bacteria.

(B) Chlordiazepoxide is a derivative of benzodiazepine and is used as a mild tranquilizer. It is prescribed to relieve anxiety and tension.

(A) $NaHCO_3$ (sodium bicarbonate) is commonly used as an antacid to neutralize excess stomach acidity.
$Mg(OH)_2$ (magnesium hydroxide),also known as milk of magnesia,is a mild base used to neutralize stomach acid.
Therefore,both $NaHCO_3$ and $Mg(OH)_2$ are used in antacid medicinal preparations.

(C) The structural features of soaps and detergents are similar,except that the polar end in detergents is $-OSO_3^-Na^+$ or $-SO_3^-Na^+$,while in soaps,the polar end is $-COO^-Na^+$.
Detergents have an advantage over soaps because their polar ends (sulphate or sulphonate groups) retain their efficiency in hard water.
This is because the corresponding $Ca^{2+}$ and $Mg^{2+}$ salts of detergents are soluble in water,whereas the $Ca^{2+}$ and $Mg^{2+}$ salts of soaps are insoluble and form scum.
Therefore,the correct reason is that their $Ca^{2+}$ and $Mg^{2+}$ salts are water soluble.

(B) Procaine is a well-known local anaesthetic used in medical procedures to numb specific areas of the body.
Chloramphenicol and Penicillin $-G$ are antibiotics used to treat bacterial infections.
Diazepam is a sedative belonging to the benzodiazepine class,used to treat anxiety and muscle spasms.

(C) Mifepristone is a synthetic steroid that acts as an antagonist to progesterone and is commonly used as a 'morning after pill' to prevent pregnancy after unprotected intercourse.

(D) Barbiturates are drugs that act as central nervous system depressants,and can,therefore,produce a wide spectrum of effects from mild sedation to total anesthesia or death.
They are used to induce sleep and are classified as hypnotics.
They are effective as anxiolytics,hypnotics,and anticonvulsants,but have physical and psychological addiction potential.
They have largely been replaced by benzodiazepines in routine medical practice,particularly in the treatment of anxiety and insomnia.

(C) The first magic bullet was fired at syphilis on this day in $1909$. Although specific diseases responded better to some drugs than to others,before the early $1900s$ development of $Salvarsan$,an arsenic-based drug to treat syphilis,drugs were not developed to target a specific disease.

(D) Chloramphenicol is a broad-spectrum antibiotic that functions by inhibiting bacterial protein synthesis. It is effective against a wide range of Gram-positive bacteria,Gram-negative bacteria,and anaerobes.

(A) Antidiabetic drugs are medications used to stabilize and control blood glucose levels in people with diabetes.
$A$. Insulin is a hormone used as an antidiabetic drug to manage blood sugar levels.
$B$. Penicillin is an antibiotic.
$C$. Chloroquine is an antimalarial drug.
$D$. Aspirin is an analgesic and antipyretic drug.
Therefore,the correct option is $A$.