Q. What is the IUPAC name for CH3-CH2-CH2-CHO? (2020)
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A.
Butanal
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B.
Propanal
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C.
Pentanal
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D.
Hexanal
Solution
The IUPAC name for CH3-CH2-CH2-CHO is Butanal, as it has a four-carbon chain with an aldehyde functional group.
Correct Answer: A — Butanal
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Q. What is the IUPAC name for CH3-CH2-CH2-COOH? (2020)
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A.
Butanoic acid
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B.
Propanoic acid
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C.
Pentanoic acid
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D.
Hexanoic acid
Solution
The IUPAC name for CH3-CH2-CH2-COOH is Butanoic acid, as it has four carbon atoms.
Correct Answer: A — Butanoic acid
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Q. What is the IUPAC name for CH3CH2COOH? (2021)
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A.
Propanoic acid
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B.
Butanoic acid
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C.
Acetic acid
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D.
Formic acid
Solution
CH3CH2COOH is propanoic acid, which has a three-carbon chain with a carboxylic acid functional group.
Correct Answer: A — Propanoic acid
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Q. What type of bond is primarily found in alkenes? (2023)
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A.
Single bond
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B.
Double bond
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C.
Triple bond
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D.
Ionic bond
Solution
Alkenes are characterized by the presence of at least one double bond between carbon atoms.
Correct Answer: B — Double bond
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Q. What type of bond is primarily found in organic compounds? (2023)
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A.
Ionic bonds
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B.
Covalent bonds
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C.
Metallic bonds
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D.
Hydrogen bonds
Solution
Organic compounds primarily consist of covalent bonds formed between carbon and other atoms.
Correct Answer: B — Covalent bonds
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Q. What type of isomerism is shown by compounds with the same molecular formula but different structural formulas? (2023)
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A.
Geometric isomerism
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B.
Structural isomerism
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C.
Optical isomerism
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D.
Conformational isomerism
Solution
Structural isomerism occurs when compounds have the same molecular formula but different structural arrangements.
Correct Answer: B — Structural isomerism
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Q. Which of the following compounds contains a carboxylic acid functional group? (2021)
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A.
C2H5OH
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B.
C3H6O
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C.
C2H4COOH
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D.
C4H10
Solution
C2H4COOH (acetic acid) contains the carboxylic acid functional group (-COOH).
Correct Answer: C — C2H4COOH
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Q. Which of the following compounds is an isomer of butane? (2021)
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A.
2-methylpropane
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B.
Pentane
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C.
Propane
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D.
Ethane
Solution
2-methylpropane is an isomer of butane, having the same molecular formula but a different structure.
Correct Answer: A — 2-methylpropane
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Q. Which of the following functional groups is present in alcohols? (2019)
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A.
-OH
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B.
-COOH
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C.
-NH2
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D.
-CHO
Solution
Alcohols contain the hydroxyl functional group (-OH).
Correct Answer: A — -OH
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Q. Which of the following is a characteristic of isomers? (2022)
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A.
Same molecular formula
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B.
Different molecular formula
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C.
Same physical properties
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D.
Same structural formula
Solution
Isomers have the same molecular formula but different structural or spatial arrangements.
Correct Answer: A — Same molecular formula
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Q. Which of the following is a characteristic of organic compounds? (2021)
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A.
They contain carbon
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B.
They are always solid
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C.
They are ionic
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D.
They do not burn
Solution
Organic compounds are primarily characterized by the presence of carbon atoms in their structure.
Correct Answer: A — They contain carbon
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Q. Which of the following is an example of a saturated hydrocarbon? (2023)
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A.
Ethylene
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B.
Propylene
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C.
Butane
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D.
Benzene
Solution
Butane is a saturated hydrocarbon, meaning it contains only single bonds between carbon atoms.
Correct Answer: C — Butane
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Q. Which of the following statements is true about alkenes? (2019)
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A.
They contain at least one double bond
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B.
They are saturated hydrocarbons
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C.
They have a general formula of C_nH_(2n+2)
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D.
They cannot undergo addition reactions
Solution
Alkenes are characterized by the presence of at least one double bond between carbon atoms.
Correct Answer: A — They contain at least one double bond
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Q. Which of the following statements is true about aromatic compounds? (2022)
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A.
They are always saturated
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B.
They contain a benzene ring
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C.
They are non-polar
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D.
They do not undergo electrophilic substitution
Solution
Aromatic compounds are characterized by the presence of a benzene ring, which is a stable cyclic structure.
Correct Answer: B — They contain a benzene ring
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