Q. Which carbohydrate is known as blood sugar?
A.
Galactose
B.
Fructose
C.
Glucose
D.
Ribose
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Solution
Glucose is commonly referred to as blood sugar as it is the primary energy source for the body's cells.
Correct Answer: C — Glucose
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Q. Which carbohydrate is primarily stored in animal liver and muscle?
A.
Cellulose
B.
Starch
C.
Glycogen
D.
Fructose
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Solution
Glycogen is the carbohydrate primarily stored in animal liver and muscle as a form of energy reserve.
Correct Answer: C — Glycogen
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Q. Which chemical is commonly found in household bleach?
A.
Hydrogen peroxide
B.
Sodium hypochlorite
C.
Ammonium hydroxide
D.
Calcium hypochlorite
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Solution
Sodium hypochlorite is the active ingredient in most household bleach products.
Correct Answer: B — Sodium hypochlorite
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Q. Which chemical is commonly used as a food preservative?
A.
Sodium chloride
B.
Sodium benzoate
C.
Vinegar
D.
Sugar
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Solution
Sodium benzoate is a widely used food preservative that inhibits the growth of bacteria and fungi.
Correct Answer: B — Sodium benzoate
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Q. Which compound can exhibit both structural and geometric isomerism?
A.
C2H4
B.
C4H8
C.
C5H10
D.
C3H6
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Solution
C4H8 can exhibit both structural isomerism (different structures) and geometric isomerism (cis/trans forms).
Correct Answer: B — C4H8
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Q. Which compound does NOT exhibit optical isomerism?
A.
Lactic acid
B.
Glucose
C.
2-butanol
D.
Butan-2-one
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Solution
Butan-2-one does not have a chiral center and therefore does not exhibit optical isomerism.
Correct Answer: D — Butan-2-one
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Q. Which compound exhibits optical isomerism?
A.
2-butanol
B.
1-butanol
C.
Cyclohexane
D.
Ethylene
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Solution
2-butanol has a chiral center and can exist as two enantiomers, thus exhibiting optical isomerism.
Correct Answer: A — 2-butanol
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Q. Which compound is commonly used as a preservative in food?
A.
Sodium chloride
B.
Sodium benzoate
C.
Potassium nitrate
D.
Calcium carbonate
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Solution
Sodium benzoate is widely used as a food preservative to prevent spoilage.
Correct Answer: B — Sodium benzoate
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Q. Which enzyme breaks down starch into glucose?
A.
Amylase
B.
Lactase
C.
Sucrase
D.
Cellulase
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Solution
Amylase is the enzyme that catalyzes the hydrolysis of starch into glucose.
Correct Answer: A — Amylase
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Q. Which enzyme is responsible for the hydrolysis of starch?
A.
Amylase
B.
Cellulase
C.
Lactase
D.
Maltase
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Solution
Amylase is the enzyme that catalyzes the hydrolysis of starch into sugars.
Correct Answer: A — Amylase
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Q. Which functional group is present in alcohols?
A.
Aldehyde
B.
Hydroxyl
C.
Carboxyl
D.
Amine
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Solution
Alcohols contain a hydroxyl (-OH) functional group.
Correct Answer: B — Hydroxyl
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Q. Which haloalkane is expected to have the highest boiling point?
A.
CH3Cl
B.
C2H5Cl
C.
C3H7Cl
D.
C4H9Cl
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Solution
C4H9Cl (butyl chloride) has the highest molecular weight and thus the highest boiling point due to increased van der Waals forces.
Correct Answer: D — C4H9Cl
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Q. Which haloalkane is least soluble in water?
A.
Chloroethane
B.
Bromoethane
C.
Iodoethane
D.
Fluoroethane
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Solution
Iodoethane is least soluble in water due to its larger non-polar iodine atom, which decreases the overall polarity of the molecule.
Correct Answer: C — Iodoethane
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Q. Which haloalkane would you expect to have the highest boiling point?
A.
Chloroethane
B.
Bromoethane
C.
Iodoethane
D.
Fluoroethane
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Solution
Iodoethane has the highest boiling point due to the larger size and greater polarizability of iodine, leading to stronger van der Waals forces.
Correct Answer: C — Iodoethane
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Q. Which level of protein structure is characterized by the arrangement of multiple polypeptide chains?
A.
Primary structure
B.
Secondary structure
C.
Tertiary structure
D.
Quaternary structure
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Solution
The quaternary structure of a protein refers to the arrangement and interaction of multiple polypeptide chains.
Correct Answer: D — Quaternary structure
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Q. Which level of protein structure is characterized by the overall 3D shape of a single polypeptide chain?
A.
Primary structure
B.
Secondary structure
C.
Tertiary structure
D.
Quaternary structure
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Solution
The tertiary structure of a protein refers to the overall 3D shape of a single polypeptide chain, determined by interactions among side chains.
Correct Answer: C — Tertiary structure
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Q. Which of the following acids is stronger than acetic acid?
A.
Formic acid
B.
Propanoic acid
C.
Butanoic acid
D.
Valeric acid
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Solution
Formic acid (HCOOH) is stronger than acetic acid (CH3COOH).
Correct Answer: A — Formic acid
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Q. Which of the following acids is the strongest?
A.
Formic acid
B.
Acetic acid
C.
Propanoic acid
D.
Butanoic acid
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Solution
Formic acid (HCOOH) is stronger than acetic acid and other listed acids.
Correct Answer: A — Formic acid
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Q. Which of the following alcohols has the highest boiling point?
A.
Methanol
B.
Ethanol
C.
Propan-1-ol
D.
Butan-1-ol
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Solution
Butan-1-ol has the highest boiling point due to its longer carbon chain and stronger hydrogen bonding.
Correct Answer: D — Butan-1-ol
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Q. Which of the following alcohols is most acidic?
A.
Methanol
B.
Ethanol
C.
Isopropanol
D.
Tert-butanol
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Solution
Methanol is the most acidic among the given alcohols due to the absence of steric hindrance.
Correct Answer: A — Methanol
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Q. Which of the following alcohols is the most acidic?
A.
Methanol
B.
Ethanol
C.
Propan-1-ol
D.
Butan-1-ol
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Solution
Methanol is the most acidic among the given alcohols due to its smaller size and higher electronegativity.
Correct Answer: A — Methanol
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Q. Which of the following alkanes has a branched structure?
A.
Butane
B.
Pentane
C.
Isobutane
D.
Hexane
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Solution
Isobutane is a branched alkane.
Correct Answer: C — Isobutane
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Q. Which of the following alkanes has a higher density than water?
A.
Ethane
B.
Propane
C.
Butane
D.
Pentane
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Solution
Butane has a higher density than water.
Correct Answer: C — Butane
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Q. Which of the following alkanes has a molecular weight closest to 72 g/mol?
A.
C5H12
B.
C6H14
C.
C7H16
D.
C8H18
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Solution
C6H14 (hexane) has a molecular weight of approximately 86 g/mol, while C7H16 (heptane) has a molecular weight of approximately 100 g/mol. The closest is C6H14.
Correct Answer: B — C6H14
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Q. Which of the following alkanes has the highest boiling point?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Butane has the highest boiling point among the given alkanes due to its larger molecular size.
Correct Answer: D — Butane
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Q. Which of the following alkanes has the lowest density?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Methane has the lowest density among the given alkanes.
Correct Answer: A — Methane
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Q. Which of the following alkanes has the lowest molecular weight?
A.
Butane
B.
Propane
C.
Ethane
D.
Methane
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Solution
Methane (CH4) has the lowest molecular weight among the given alkanes.
Correct Answer: D — Methane
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Q. Which of the following alkanes is a gas at room temperature?
A.
Hexane
B.
Octane
C.
Decane
D.
Methane
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Solution
Methane is a gas at room temperature.
Correct Answer: D — Methane
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Q. Which of the following alkanes is branched?
A.
Butane
B.
Pentane
C.
Isobutane
D.
Hexane
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Solution
Isobutane is a branched alkane, while butane, pentane, and hexane are straight-chain alkanes.
Correct Answer: C — Isobutane
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Q. Which of the following alkanes is the least branched?
A.
2-Methylbutane
B.
3-Methylpentane
C.
Butane
D.
Hexane
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Solution
Butane is the least branched alkane among the options.
Correct Answer: C — Butane
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