Engineering & Architecture Admissions
Q. Which reagent is commonly used to test for the presence of unsaturation in organic compounds?
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A.
Bromine water
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B.
Sodium hydroxide
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C.
Hydrochloric acid
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D.
Silver nitrate
Solution
Bromine water is used to test for unsaturation; it decolorizes in the presence of alkenes or alkynes.
Correct Answer: A — Bromine water
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Q. Which reagent is commonly used to test for unsaturation in organic compounds?
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A.
Bromine water
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B.
Sodium bicarbonate
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C.
Potassium permanganate
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D.
Both 1 and 3
Solution
Bromine water and potassium permanganate are both used to test for unsaturation in organic compounds.
Correct Answer: D — Both 1 and 3
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Q. Which reagent is used for the oxidation of primary alcohols to aldehydes?
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A.
KMnO4
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B.
PCC
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C.
Na2Cr2O7
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D.
H2SO4
Solution
Pyridinium chlorochromate (PCC) is commonly used to oxidize primary alcohols to aldehydes without further oxidation to carboxylic acids.
Correct Answer: B — PCC
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Q. Which reagent is used for the selective hydrogenation of alkynes to alkenes?
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A.
Pd/BaSO4
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B.
LiAlH4
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C.
H2/Pt
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D.
NaNH2
Solution
Pd/BaSO4 is used as a catalyst for the selective hydrogenation of alkynes to form alkenes.
Correct Answer: A — Pd/BaSO4
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Q. Which reagent is used for the test of unsaturation in alkenes?
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A.
Bromine water
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B.
Potassium permanganate
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C.
Sodium dichromate
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D.
All of the above
Solution
Bromine water is commonly used to test for unsaturation; it decolorizes in the presence of alkenes.
Correct Answer: A — Bromine water
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Q. Which reagent is used to convert a carboxylic acid to an alcohol?
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A.
LiAlH4
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B.
NaBH4
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C.
H2SO4
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D.
KMnO4
Solution
Lithium aluminum hydride (LiAlH4) is used to reduce carboxylic acids to alcohols.
Correct Answer: A — LiAlH4
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Q. Which reagent is used to convert alcohols to alkyl halides?
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A.
SOCl2
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B.
NaOH
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C.
H2SO4
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D.
KMnO4
Solution
Thionyl chloride (SOCl2) is commonly used to convert alcohols to alkyl halides.
Correct Answer: A — SOCl2
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Q. Which reagent is used to convert an alcohol to an alkene?
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A.
H2SO4
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B.
NaOH
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C.
KMnO4
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D.
HCl
Solution
Concentrated sulfuric acid (H2SO4) is commonly used for dehydration of alcohols to form alkenes.
Correct Answer: A — H2SO4
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Q. Which reagent is used to convert an alcohol to an alkyl halide?
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A.
SOCl2
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B.
H2SO4
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C.
NaBr
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D.
KMnO4
Solution
Thionyl chloride (SOCl2) is commonly used to convert alcohols to alkyl halides.
Correct Answer: A — SOCl2
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Q. Which reagent is used to convert an aldehyde to a primary alcohol?
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A.
LiAlH4
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B.
NaBH4
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C.
H2/Pd
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D.
All of the above
Solution
All of the above reagents can reduce an aldehyde to a primary alcohol.
Correct Answer: D — All of the above
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Q. Which reagent is used to convert an alkene to an alcohol?
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A.
H2O
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B.
H2
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C.
HCl
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D.
NaOH
Solution
Water (H2O) in the presence of an acid catalyst can convert an alkene to an alcohol through hydration.
Correct Answer: A — H2O
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Q. Which reagent is used to convert an alkyne to a cis-alkene?
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A.
H2/Pd
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B.
H2/Lindlar's catalyst
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C.
Li/NH3
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D.
Na/NH3
Solution
H2 in the presence of Lindlar's catalyst is used to convert an alkyne to a cis-alkene.
Correct Answer: B — H2/Lindlar's catalyst
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Q. Which reagent is used to convert haloalkanes to alcohols?
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A.
Sodium hydroxide
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B.
Sodium bicarbonate
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C.
Sodium chloride
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D.
Sodium acetate
Solution
Sodium hydroxide is commonly used to convert haloalkanes to alcohols through nucleophilic substitution.
Correct Answer: A — Sodium hydroxide
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Q. Which reagent is used to convert phenol to phenyl ether?
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A.
Sodium hydroxide
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B.
Sodium phenoxide
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C.
Bromine
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D.
Hydrochloric acid
Solution
Sodium phenoxide reacts with alkyl halides to form phenyl ethers in a nucleophilic substitution reaction.
Correct Answer: B — Sodium phenoxide
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Q. Which reagent is used to distinguish between aldehydes and ketones?
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A.
Benedict's solution
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B.
Tollens' reagent
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C.
Fehling's solution
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D.
All of the above
Solution
All of the mentioned reagents can be used to distinguish between aldehydes and ketones, as aldehydes reduce these reagents while ketones do not.
Correct Answer: D — All of the above
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Q. Which reagent is used to test for the presence of alkenes?
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A.
Bromine water
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B.
Potassium permanganate
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C.
Both A and B
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D.
None of the above
Solution
Both bromine water and potassium permanganate can be used to test for alkenes, as they react with the double bond.
Correct Answer: C — Both A and B
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Q. Which s-block element has the highest atomic radius?
Solution
Rubidium (Rb) has the highest atomic radius among the given s-block elements.
Correct Answer: D — Rb
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Q. Which s-block element is used in fireworks for producing a bright red color?
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A.
Lithium
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B.
Sodium
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C.
Potassium
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D.
Calcium
Solution
Lithium is used in fireworks to produce a bright red color.
Correct Answer: A — Lithium
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Q. Which state of matter has particles that are far apart and move freely?
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A.
Solid
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B.
Liquid
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C.
Gas
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D.
None of the above
Solution
In gases, particles are far apart and move freely, allowing them to fill the container they are in.
Correct Answer: C — Gas
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Q. Which state of matter has the weakest intermolecular forces?
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A.
Solid
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B.
Liquid
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C.
Gas
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D.
Plasma
Solution
Gases have the weakest intermolecular forces, allowing particles to move freely.
Correct Answer: C — Gas
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Q. Which state of matter is characterized by having no fixed shape and no fixed volume?
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A.
Solid
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B.
Liquid
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C.
Gas
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D.
Plasma
Solution
Gases have neither a fixed shape nor a fixed volume, allowing them to expand to fill their container.
Correct Answer: C — Gas
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Q. Which substituent has both +M and -I effects?
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A.
-OH
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B.
-NH2
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C.
-COOH
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D.
-NO2
Solution
-NH2 has a +M effect due to resonance donation and a -I effect due to electronegativity.
Correct Answer: B — -NH2
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Q. Which substituent is a strong +I and +M director?
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A.
-NO2
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B.
-OH
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C.
-CN
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D.
-COOH
Solution
-OH is a strong +I and +M director due to its ability to donate electron density through resonance.
Correct Answer: B — -OH
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Q. Which substituent is a strong +M director?
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A.
-CHO
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B.
-NO2
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C.
-OH
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D.
-Br
Solution
The -OH group is a strong +M director due to its ability to donate electron density through resonance.
Correct Answer: C — -OH
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Q. Which theorem is used to find the moment of inertia of a body about an axis that is parallel to an axis through its center of mass?
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A.
Perpendicular axis theorem
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B.
Parallel axis theorem
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C.
Pythagorean theorem
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D.
Conservation of angular momentum
Solution
The parallel axis theorem is used to find the moment of inertia about an axis parallel to one through the center of mass.
Correct Answer: B — Parallel axis theorem
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Q. Which transition metal is known for forming complex ions with a variety of ligands?
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A.
Zinc (Zn)
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B.
Copper (Cu)
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C.
Iron (Fe)
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D.
Nickel (Ni)
Solution
Copper (Cu) is known for forming complex ions with a variety of ligands due to its ability to adopt multiple oxidation states.
Correct Answer: B — Copper (Cu)
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Q. Which transition metal is known for forming complex ions?
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A.
Calcium
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B.
Copper
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C.
Sodium
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D.
Magnesium
Solution
Copper (Cu) is well-known for forming various complex ions due to its ability to coordinate with ligands.
Correct Answer: B — Copper
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Q. Which transition metal is known for its ability to form complex ions with a variety of ligands?
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A.
Zinc (Zn)
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B.
Copper (Cu)
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C.
Iron (Fe)
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D.
Nickel (Ni)
Solution
Copper (Cu) is known for its ability to form complex ions with a variety of ligands due to its d-orbital configuration.
Correct Answer: C — Iron (Fe)
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Q. Which type of damping results in the system returning to equilibrium without oscillating?
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A.
Underdamping
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B.
Critical damping
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C.
Overdamping
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D.
No damping
Solution
Critical damping allows the system to return to equilibrium in the shortest time without oscillating.
Correct Answer: B — Critical damping
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Q. Which type of diffraction pattern is produced by a circular aperture?
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A.
Single-slit pattern
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B.
Double-slit pattern
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C.
Airy pattern
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D.
Newton's rings
Solution
A circular aperture produces an Airy pattern, characterized by a central bright spot surrounded by concentric dark and bright rings.
Correct Answer: C — Airy pattern
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