Q. What is the product of the reaction of an alcohol with a carboxylic acid?
-
A.
Ester
-
B.
Ether
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C.
Aldehyde
-
D.
Ketone
Solution
The reaction of an alcohol with a carboxylic acid produces an ester through a process called esterification.
Correct Answer: A — Ester
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Q. What is the product of the reaction of chlorobenzene with sodium hydroxide at high temperature?
-
A.
Phenol
-
B.
Benzene
-
C.
Chlorobenzene
-
D.
Sodium chloride
Solution
The reaction of chlorobenzene with sodium hydroxide at high temperature leads to the formation of phenol through nucleophilic aromatic substitution.
Correct Answer: A — Phenol
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Q. What is the product of the reaction of ethylene with chlorine?
-
A.
Ethyl chloride
-
B.
1,2-dichloroethane
-
C.
Chloroethane
-
D.
Ethylene dichloride
Solution
The reaction of ethylene with chlorine results in the formation of 1,2-dichloroethane through an electrophilic addition mechanism.
Correct Answer: B — 1,2-dichloroethane
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Q. What is the product of the reaction of propene with HBr?
-
A.
1-Bromopropane
-
B.
2-Bromopropane
-
C.
Propyl bromide
-
D.
Bromopropene
Solution
The reaction follows Markovnikov's rule, leading to the formation of 2-Bromopropane.
Correct Answer: B — 2-Bromopropane
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Q. What is the product when propan-2-one reacts with iodine in the presence of a base?
-
A.
Iodoform
-
B.
Bromoform
-
C.
Chloroform
-
D.
No reaction
Solution
Propan-2-one reacts with iodine in the presence of a base to form iodoform (CHI3).
Correct Answer: A — Iodoform
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Q. What is the repeating unit in polyethylene?
-
A.
-CH2-CH2-
-
B.
-C6H5-
-
C.
-C3H6-
-
D.
-C2H4-
Solution
The repeating unit in polyethylene is -CH2-CH2-, derived from ethylene monomers.
Correct Answer: A — -CH2-CH2-
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Q. What is the role of antioxidants in food?
-
A.
Enhancing flavor
-
B.
Preventing spoilage
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C.
Reducing oxidation
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D.
Increasing acidity
Solution
Antioxidants prevent oxidation, which can spoil food and reduce its nutritional value.
Correct Answer: C — Reducing oxidation
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Q. What is the role of antioxidants in the body?
-
A.
Increase energy
-
B.
Prevent oxidation
-
C.
Enhance digestion
-
D.
Boost immunity
Solution
Antioxidants prevent oxidation, which can damage cells and lead to various diseases.
Correct Answer: B — Prevent oxidation
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Q. What is the role of ATP in cells?
-
A.
Storage of genetic information
-
B.
Energy currency
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C.
Structural component
-
D.
Signal transduction
Solution
ATP (adenosine triphosphate) serves as the primary energy currency in cells.
Correct Answer: B — Energy currency
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Q. What is the role of caffeine in coffee?
-
A.
Antioxidant
-
B.
Stimulant
-
C.
Sedative
-
D.
Digestive aid
Solution
Caffeine acts as a stimulant, increasing alertness and reducing fatigue.
Correct Answer: B — Stimulant
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Q. What is the role of emulsifiers in food products?
-
A.
Thickeners
-
B.
Stabilizers
-
C.
Flavor enhancers
-
D.
Coloring agents
Solution
Emulsifiers help to stabilize mixtures of oil and water in food products.
Correct Answer: B — Stabilizers
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Q. What is the role of enzymes in biochemical reactions?
-
A.
Increase activation energy
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B.
Decrease activation energy
-
C.
Change the equilibrium of the reaction
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D.
Provide energy for the reaction
Solution
Enzymes act as catalysts that decrease the activation energy required for biochemical reactions.
Correct Answer: B — Decrease activation energy
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Q. What is the role of enzymes in biological systems?
-
A.
To provide structural support
-
B.
To act as catalysts for biochemical reactions
-
C.
To store genetic information
-
D.
To transport molecules across membranes
Solution
Enzymes are proteins that act as catalysts, speeding up biochemical reactions without being consumed in the process.
Correct Answer: B — To act as catalysts for biochemical reactions
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Q. What is the role of histamines in the body?
-
A.
To promote sleep
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B.
To regulate blood sugar
-
C.
To trigger allergic reactions
-
D.
To enhance digestion
Solution
Histamines are chemicals that play a key role in allergic reactions.
Correct Answer: C — To trigger allergic reactions
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Q. What is the role of RNA in protein synthesis?
-
A.
Storage of genetic information
-
B.
Transcription of DNA
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C.
Translation of proteins
-
D.
Both transcription and translation
Solution
RNA plays a crucial role in both the transcription of DNA and the translation of proteins.
Correct Answer: D — Both transcription and translation
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Q. What is the simplest form of carbohydrate?
-
A.
Disaccharide
-
B.
Monosaccharide
-
C.
Polysaccharide
-
D.
Oligosaccharide
Solution
The simplest form of carbohydrate is a monosaccharide, which cannot be hydrolyzed into simpler sugars.
Correct Answer: B — Monosaccharide
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Q. What is the structural formula for 2-methylpropane?
-
A.
CH3-CH2-CH(CH3)-CH3
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B.
CH3-CH(CH3)-CH2-CH3
-
C.
CH3-CH2-CH2-CH3
-
D.
CH3-CH2-CH(CH2)-CH3
Solution
The structural formula for 2-methylpropane is CH3-CH(CH3)-CH2-CH3.
Correct Answer: B — CH3-CH(CH3)-CH2-CH3
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Q. What is the structural formula for hexane?
-
A.
C6H14
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B.
C5H12
-
C.
C4H10
-
D.
C3H8
Solution
The structural formula for hexane is C6H14.
Correct Answer: A — C6H14
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Q. What is the structural formula of 2-methylpropane?
-
A.
CH3-CH2-CH(CH3)-CH3
-
B.
CH3-CH(CH3)-CH2-CH3
-
C.
CH3-CH2-CH2-CH3
-
D.
CH3-CH2-CH(CH2)-CH3
Solution
The structural formula of 2-methylpropane is CH3-CH(CH3)-CH2-CH3.
Correct Answer: B — CH3-CH(CH3)-CH2-CH3
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Q. What is the structural formula of propane?
-
A.
C3H8
-
B.
C2H6
-
C.
C4H10
-
D.
C5H12
Solution
The structural formula of propane is C3H8, indicating three carbon atoms.
Correct Answer: A — C3H8
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Q. What is the structure of DNA?
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A.
Single-stranded
-
B.
Double helix
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C.
Triple helix
-
D.
Linear
Solution
DNA has a double helix structure, consisting of two strands that coil around each other.
Correct Answer: B — Double helix
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Q. What role do enzymes play in biological systems?
-
A.
They provide structural support
-
B.
They act as catalysts for biochemical reactions
-
C.
They store genetic information
-
D.
They transport molecules across membranes
Solution
Enzymes are proteins that act as catalysts, speeding up biochemical reactions without being consumed in the process.
Correct Answer: B — They act as catalysts for biochemical reactions
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Q. What type of alcohol is isopropanol?
-
A.
Primary
-
B.
Secondary
-
C.
Tertiary
-
D.
None of the above
Solution
Isopropanol (2-propanol) is a secondary alcohol, as the hydroxyl group is attached to a carbon that is connected to two other carbons.
Correct Answer: B — Secondary
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Q. What type of biomolecule are enzymes classified as?
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A.
Carbohydrates
-
B.
Proteins
-
C.
Lipids
-
D.
Nucleic acids
Solution
Enzymes are primarily proteins that catalyze biochemical reactions.
Correct Answer: B — Proteins
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Q. What type of biomolecule is insulin?
-
A.
Carbohydrate
-
B.
Lipid
-
C.
Protein
-
D.
Nucleic acid
Solution
Insulin is a protein hormone that regulates glucose levels in the blood.
Correct Answer: C — Protein
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Q. What type of bond forms between the carboxyl group of one amino acid and the amino group of another?
-
A.
Hydrogen bond
-
B.
Ionic bond
-
C.
Peptide bond
-
D.
Disulfide bond
Solution
A peptide bond forms between the carboxyl group of one amino acid and the amino group of another, linking them together in a protein.
Correct Answer: C — Peptide bond
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Q. What type of bond is formed between amino acids in a protein?
-
A.
Ionic bond
-
B.
Covalent bond
-
C.
Hydrogen bond
-
D.
Van der Waals forces
Solution
A covalent bond, specifically a peptide bond, is formed between amino acids in a protein.
Correct Answer: B — Covalent bond
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Q. What type of bond is formed between the amino group of one amino acid and the carboxyl group of another?
-
A.
Ionic bond
-
B.
Hydrogen bond
-
C.
Peptide bond
-
D.
Covalent bond
Solution
A peptide bond is formed between the amino group of one amino acid and the carboxyl group of another.
Correct Answer: C — Peptide bond
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Q. What type of bond is primarily responsible for the secondary structure of proteins?
-
A.
Ionic bonds
-
B.
Hydrogen bonds
-
C.
Covalent bonds
-
D.
Disulfide bonds
Solution
Hydrogen bonds are primarily responsible for the formation of secondary structures like alpha-helices and beta-pleated sheets in proteins.
Correct Answer: B — Hydrogen bonds
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Q. What type of bond links amino acids in proteins?
-
A.
Ionic bond
-
B.
Covalent bond
-
C.
Hydrogen bond
-
D.
Van der Waals forces
Solution
Amino acids are linked by peptide bonds, which are a type of covalent bond.
Correct Answer: B — Covalent bond
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