Q. What is the main product when ethylamine is treated with nitrous acid?
A.
Ethyl alcohol
B.
Ethyl diazonium salt
C.
Ethylamine hydrochloride
D.
No reaction
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Solution
Ethylamine reacts with nitrous acid to form ethyl diazonium salt, which is a key intermediate in organic synthesis.
Correct Answer: B — Ethyl diazonium salt
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Q. What is the main product when hydrogen reacts with nitrogen at high temperatures?
A.
Ammonia
B.
Hydrazine
C.
Nitric oxide
D.
Nitrogen gas
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Solution
The main product of the reaction between hydrogen and nitrogen at high temperatures is ammonia (NH3).
Correct Answer: A — Ammonia
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Q. What is the main product when hydrogen reacts with oxygen? (2019)
A.
Water
B.
Hydrogen peroxide
C.
Ozone
D.
Hydroxide
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Solution
When hydrogen reacts with oxygen, the main product formed is water (H2O).
Correct Answer: A — Water
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Q. What is the main product when phenol is treated with bromine water?
A.
Bromobenzene
B.
2,4,6-Tribromophenol
C.
Bromophenol
D.
Benzene
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Solution
Phenol reacts with bromine water to form 2,4,6-tribromophenol, a white precipitate.
Correct Answer: B — 2,4,6-Tribromophenol
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Q. What is the main product when phenol is treated with bromine?
A.
Bromobenzene
B.
Bromophenol
C.
Benzene
D.
Bromobutane
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Solution
Bromine reacts with phenol to form bromophenol, which is a substitution product.
Correct Answer: B — Bromophenol
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Q. What is the main product when phenol is treated with zinc dust?
A.
Benzene
B.
Cyclohexanol
C.
Toluene
D.
Phenyl ether
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Solution
Zinc dust reduces phenol to benzene.
Correct Answer: A — Benzene
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Q. What is the main product when phenol reacts with bromine water?
A.
Bromobenzene
B.
2,4,6-tribromophenol
C.
Bromophenol
D.
Benzene
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Solution
Phenol reacts with bromine water to form 2,4,6-tribromophenol, a white precipitate.
Correct Answer: B — 2,4,6-tribromophenol
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Q. What is the main product when phenol reacts with bromine? (2019)
A.
Bromobenzene
B.
Bromophenol
C.
Benzene
D.
No reaction
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Solution
Phenol reacts with bromine to form Bromophenol, which is a brominated derivative of phenol.
Correct Answer: B — Bromophenol
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Q. What is the main product when phenol reacts with concentrated sulfuric acid?
A.
Phenyl sulfate
B.
Benzene
C.
Catechol
D.
Anisole
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Solution
The main product is phenyl sulfate, formed by the electrophilic substitution of the hydroxyl group.
Correct Answer: A — Phenyl sulfate
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Q. What is the main product when phenol reacts with sodium hydroxide?
A.
Sodium phenoxide
B.
Sodium benzoate
C.
Benzene
D.
Phenyl acetate
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Solution
Phenol reacts with sodium hydroxide to form sodium phenoxide, which is a salt of phenol.
Correct Answer: A — Sodium phenoxide
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Q. What is the main product when propan-2-one is treated with iodine in the presence of a base?
A.
Iodoform
B.
Acetone
C.
Bromoform
D.
Chloroform
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Solution
Propan-2-one (acetone) reacts with iodine in the presence of a base to form Iodoform.
Correct Answer: A — Iodoform
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Q. What is the main product when propan-2-one is treated with sodium bisulfite?
A.
Sodium propan-2-one sulfonate
B.
Propan-2-ol
C.
Propan-2-one bisulfite adduct
D.
None of the above
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Solution
The main product is the propan-2-one bisulfite adduct.
Correct Answer: C — Propan-2-one bisulfite adduct
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Q. What is the main product when propan-2-one is treated with sodium borohydride? (2023)
A.
Propan-1-ol
B.
Propan-2-ol
C.
Propan-3-ol
D.
No reaction
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Solution
Sodium borohydride reduces propan-2-one to propan-2-ol, which is a secondary alcohol.
Correct Answer: B — Propan-2-ol
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Q. What is the main product when propanal is treated with excess alcohol in the presence of an acid catalyst?
A.
Aldol
B.
Acetal
C.
Ketone
D.
Carboxylic acid
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Solution
When propanal is treated with excess alcohol in the presence of an acid catalyst, an acetal is formed.
Correct Answer: B — Acetal
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Q. What is the main product when propanal is treated with excess Grignard reagent followed by hydrolysis?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Propan-1,2-diol
D.
Butan-2-ol
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Solution
The reaction of propanal with excess Grignard reagent followed by hydrolysis yields propan-2-ol.
Correct Answer: B — Propan-2-ol
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Q. What is the main product when propanal is treated with excess hydrogen in the presence of a catalyst?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Propanoic acid
D.
Propane
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Solution
Propanal is reduced to propan-1-ol when treated with excess hydrogen in the presence of a catalyst.
Correct Answer: A — Propan-1-ol
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Q. What is the main product when propanal is treated with sodium bisulfite? (2019)
A.
Sodium propanoate
B.
Propyl sulfonate
C.
Propane-1,2-diol
D.
A bisulfite adduct
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Solution
Propanal reacts with sodium bisulfite to form a bisulfite adduct, which is a characteristic reaction of aldehydes.
Correct Answer: D — A bisulfite adduct
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Q. What is the main product when propanoic acid is treated with thionyl chloride?
A.
Propyl chloride
B.
Propanoic anhydride
C.
Propionyl chloride
D.
Propylene
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Solution
The reaction of propanoic acid with thionyl chloride produces propionyl chloride.
Correct Answer: C — Propionyl chloride
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Q. What is the main product when propene is reacted with hydrogen in the presence of a catalyst?
A.
Propane
B.
Butane
C.
Ethane
D.
Cyclopropane
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Solution
The main product of the hydrogenation of propene is propane.
Correct Answer: A — Propane
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Q. What is the main product when propene undergoes hydroboration-oxidation?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Propanoic acid
D.
Butanol
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Solution
The main product of hydroboration-oxidation of propene is propan-2-ol.
Correct Answer: B — Propan-2-ol
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Q. What is the main product when toluene is nitrated?
A.
Nitrotoluene
B.
Dinitrotoluene
C.
Benzaldehyde
D.
Benzyl alcohol
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Solution
Nitration of toluene primarily yields nitrotoluene, with the nitro group being directed to the ortho and para positions.
Correct Answer: A — Nitrotoluene
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Q. What is the main purpose of a choke in an AC circuit? (2022)
A.
To increase current
B.
To decrease current
C.
To store energy
D.
To convert AC to DC
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Solution
A choke is used to decrease current in an AC circuit by providing inductive reactance.
Correct Answer: B — To decrease current
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Q. What is the main purpose of a motherboard?
A.
Store data
B.
Connect all components
C.
Power the computer
D.
Input data
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Solution
The motherboard connects all components of a computer, allowing them to communicate with each other.
Correct Answer: B — Connect all components
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Q. What is the main purpose of a Punnett square? (2020)
A.
To determine the phenotype
B.
To predict genetic variation
C.
To identify alleles
D.
To analyze pedigrees
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Solution
A Punnett square is used to predict the genetic variation and possible genotypes of offspring from a genetic cross.
Correct Answer: B — To predict genetic variation
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Q. What is the main purpose of amniotic fluid? (2022)
A.
Protection of the fetus
B.
Nourishment of the fetus
C.
Gas exchange
D.
Hormonal regulation
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Solution
Amniotic fluid serves to protect the fetus by cushioning it from physical shocks and providing a stable environment.
Correct Answer: A — Protection of the fetus
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Q. What is the main purpose of an operating system's kernel? (2023)
A.
To provide a user interface
B.
To manage system resources
C.
To run applications
D.
To connect to the internet
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Solution
The kernel is the core component of an operating system that manages system resources and communication between hardware and software.
Correct Answer: B — To manage system resources
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Q. What is the main purpose of classification in biology? (2019)
A.
To identify organisms
B.
To understand evolutionary relationships
C.
To simplify the study of organisms
D.
All of the above
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Solution
The main purpose of classification in biology is to identify organisms, understand evolutionary relationships, and simplify the study of organisms.
Correct Answer: D — All of the above
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Q. What is the main purpose of emulsifiers in food products?
A.
Thicken
B.
Stabilize mixtures
C.
Add flavor
D.
Preserve freshness
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Solution
Emulsifiers stabilize mixtures of oil and water, preventing separation in food products.
Correct Answer: B — Stabilize mixtures
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Q. What is the main purpose of family planning? (2021)
A.
To increase population growth
B.
To allow couples to decide the number and spacing of children
C.
To promote early childbirth
D.
To discourage contraceptive use
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Solution
Family planning enables couples to make informed decisions about the number and spacing of their children.
Correct Answer: B — To allow couples to decide the number and spacing of children
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Q. What is the main purpose of reading comprehension strategies?
A.
To memorize information
B.
To improve reading speed
C.
To enhance understanding of the text
D.
To increase vocabulary
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Solution
Reading comprehension strategies are designed to enhance understanding of the text by helping readers to process and interpret information effectively.
Correct Answer: C — To enhance understanding of the text
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