Organic Chemistry Basics
Q. How does the presence of a +M group affect the stability of a carbocation?
-
A.
Increases stability
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B.
Decreases stability
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C.
No effect
-
D.
Depends on the solvent
Solution
A +M group increases the stability of a carbocation by donating electron density through resonance.
Correct Answer: A — Increases stability
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Q. Identify the group that shows a -I effect.
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A.
-NH2
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B.
-CH3
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C.
-F
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D.
-OCH3
Solution
The -F group shows a -I effect as it withdraws electron density through its electronegativity.
Correct Answer: C — -F
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Q. Identify the IUPAC name for the compound with the structure CH3-CH(CH3)-C(CH3)2-COOH.
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A.
3-Methylbutanoic acid
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B.
2-Methylbutanoic acid
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C.
3,3-Dimethylbutanoic acid
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D.
2,3-Dimethylbutanoic acid
Solution
The compound has a carboxylic acid group and a total of 5 carbons with two methyl groups on the third carbon, making it 3,3-Dimethylbutanoic acid.
Correct Answer: C — 3,3-Dimethylbutanoic acid
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Q. Identify the IUPAC name for the compound with the structure CH3-CH(CH3)-C(CH3)2-CH2-CH3.
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A.
2,3-Dimethylpentane
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B.
3,3-Dimethylpentane
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C.
2-Methylhexane
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D.
3-Methylhexane
Solution
The longest chain has 5 carbons, and there are two methyl groups on the third carbon, making it 3,3-Dimethylpentane.
Correct Answer: B — 3,3-Dimethylpentane
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Q. In which of the following cases does the mesomeric effect dominate over the inductive effect?
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A.
Aromatic compounds
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B.
Aliphatic compounds
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C.
Alkynes
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D.
Alkenes
Solution
In aromatic compounds, the mesomeric effect dominates due to resonance stabilization.
Correct Answer: A — Aromatic compounds
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Q. In which of the following compounds does the inductive effect play a significant role?
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A.
Benzene
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B.
Acetic acid
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C.
Cyclohexane
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D.
Ethylene
Solution
In acetic acid, the inductive effect of the –COOH group influences the acidity of the compound.
Correct Answer: B — Acetic acid
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Q. What is the effect of -NO2 group on the stability of benzene derivatives?
-
A.
Stabilizing
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B.
Destabilizing
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C.
No effect
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D.
Enhancing acidity
Solution
-NO2 is a strong electron-withdrawing group and destabilizes benzene derivatives.
Correct Answer: B — Destabilizing
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Q. What is the effect of a -CF3 group on the stability of a benzene ring?
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A.
Stabilizing
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B.
Destabilizing
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C.
No effect
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D.
Depends on substituents
Solution
-CF3 is a strong electron-withdrawing group, which destabilizes the benzene ring.
Correct Answer: B — Destabilizing
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Q. What is the effect of a -CH3 group on the stability of a carbocation?
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A.
Destabilizes
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B.
No effect
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C.
Stabilizes
-
D.
Increases acidity
Solution
The -CH3 group is an electron-donating group and stabilizes the carbocation through hyperconjugation.
Correct Answer: C — Stabilizes
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Q. What is the effect of a -COOH group on the stability of a benzene ring?
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A.
Stabilizing
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B.
Destabilizing
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C.
No effect
-
D.
Depends on substituents
Solution
The -COOH group is a strong electron-withdrawing group, thus it destabilizes the benzene ring.
Correct Answer: B — Destabilizing
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Q. What is the effect of a -I group on the acidity of a carboxylic acid?
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A.
Increases acidity
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B.
Decreases acidity
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C.
No effect
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D.
Only affects basicity
Solution
A -I group increases the acidity of a carboxylic acid by stabilizing the negative charge on the conjugate base.
Correct Answer: A — Increases acidity
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Q. What is the effect of a -I group on the acidity of carboxylic acids?
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A.
Increases acidity
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B.
Decreases acidity
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C.
No effect
-
D.
Depends on the solvent
Solution
A -I group increases the acidity of carboxylic acids by stabilizing the negative charge on the conjugate base.
Correct Answer: A — Increases acidity
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Q. What is the effect of a -NO2 group on the stability of a benzene ring?
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A.
Stabilizing
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B.
Destabilizing
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C.
No effect
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D.
Enhances reactivity
Solution
The -NO2 group is a strong electron-withdrawing group, which destabilizes the benzene ring.
Correct Answer: B — Destabilizing
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Q. What is the effect of the +M effect on the stability of a carbocation?
-
A.
Destabilizes the carbocation
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B.
Stabilizes the carbocation
-
C.
No effect on stability
-
D.
Increases acidity
Solution
The +M effect stabilizes the carbocation by donating electron density through resonance.
Correct Answer: B — Stabilizes the carbocation
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Q. What is the effect of the -I effect on acidity?
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A.
Increases acidity
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B.
Decreases acidity
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C.
No effect on acidity
-
D.
Depends on the solvent
Solution
The -I effect increases acidity by stabilizing the negative charge on the conjugate base.
Correct Answer: A — Increases acidity
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Q. What is the effect of the -I group on acidity?
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A.
Increases acidity
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B.
Decreases acidity
-
C.
No effect on acidity
-
D.
Depends on the solvent
Solution
Electron-withdrawing groups (-I) increase the acidity of compounds by stabilizing the negative charge on the conjugate base.
Correct Answer: A — Increases acidity
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Q. What is the effect of the -M (mesomeric) effect on the stability of a carbocation?
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A.
Destabilizes the carbocation
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B.
Stabilizes the carbocation
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C.
No effect on stability
-
D.
Increases acidity
Solution
The -M effect can stabilize a carbocation by delocalizing the positive charge.
Correct Answer: B — Stabilizes the carbocation
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Q. What is the effect of the -M group on the stability of a carbocation?
-
A.
Destabilizes the carbocation
-
B.
Stabilizes the carbocation
-
C.
No effect on stability
-
D.
Increases acidity
Solution
-M groups destabilize carbocations by withdrawing electron density through resonance.
Correct Answer: A — Destabilizes the carbocation
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Q. What is the functional group present in alcohols?
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A.
Aldehyde
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B.
Ketone
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C.
Hydroxyl
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D.
Carboxylic acid
Solution
Alcohols contain a hydroxyl (-OH) functional group.
Correct Answer: C — Hydroxyl
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Q. What is the IUPAC name for the compound C2H5-CHO?
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A.
Ethanal
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B.
Propanoic acid
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C.
Acetaldehyde
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D.
Butanal
Solution
The compound is an aldehyde with two carbons, hence the name is Ethanal.
Correct Answer: A — Ethanal
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Q. What is the IUPAC name for the compound C2H5-CO-CH3?
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A.
2-Pentanone
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B.
3-Pentanone
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C.
Butan-2-one
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D.
Butan-3-one
Solution
The compound is a ketone with four carbons, and the carbonyl group is on the second carbon, hence Butan-2-one.
Correct Answer: C — Butan-2-one
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Q. What is the IUPAC name for the compound C2H5OH?
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A.
Ethanol
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B.
Ethylene
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C.
Ethane
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D.
Acetaldehyde
Solution
C2H5OH is ethanol, which is an alcohol with two carbon atoms.
Correct Answer: A — Ethanol
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Q. What is the IUPAC name for the compound C3H7-CO-CH3?
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A.
2-Pentanone
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B.
3-Pentanone
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C.
Butan-2-one
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D.
Butan-3-one
Solution
The compound is a ketone with a four-carbon chain, and the carbonyl group is on the second carbon, hence it is Butan-2-one.
Correct Answer: C — Butan-2-one
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Q. What is the IUPAC name for the compound C6H12O?
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A.
Hexanal
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B.
Hexan-1-ol
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C.
Cyclohexanol
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D.
2-Hexanol
Solution
The compound is a cyclic alcohol with six carbons, hence it is named Cyclohexanol.
Correct Answer: C — Cyclohexanol
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Q. What is the IUPAC name for the compound C6H5-CH(CH3)-OH?
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A.
Benzyl alcohol
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B.
Phenylpropan-2-ol
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C.
2-Phenylpropan-1-ol
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D.
2-Phenylpropan-2-ol
Solution
The compound has a phenyl group and a hydroxyl group on the second carbon of a three-carbon chain, hence it is Phenylpropan-2-ol.
Correct Answer: B — Phenylpropan-2-ol
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Q. What is the IUPAC name for the compound CH3-CH(CH3)-CH2-CH3?
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A.
2-Methylbutane
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B.
3-Methylbutane
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C.
Butane
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D.
Pentane
Solution
The longest chain has four carbons, and there is a methyl group on the second carbon, making it 2-Methylbutane.
Correct Answer: A — 2-Methylbutane
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Q. What is the IUPAC name for the compound CH3-CH(CH3)-CH2-CHO?
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A.
3-Methylbutanal
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B.
2-Methylbutanal
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C.
4-Methylbutanal
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D.
Pentanal
Solution
The longest chain has four carbons with an aldehyde group, and the methyl group is on the second carbon, making it 2-Methylbutanal.
Correct Answer: B — 2-Methylbutanal
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Q. What is the IUPAC name for the compound CH3-CH2-CH2-CH2-COOH?
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A.
Pentanoic acid
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B.
Butanoic acid
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C.
Hexanoic acid
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D.
Heptanoic acid
Solution
The longest carbon chain contains five carbons, and the functional group is a carboxylic acid, hence the name is Pentanoic acid.
Correct Answer: A — Pentanoic acid
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Q. What is the IUPAC name for the compound with the formula C2H5-CHO?
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A.
Ethanal
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B.
Propanoic acid
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C.
Acetaldehyde
-
D.
Butanal
Solution
The compound is an aldehyde with two carbons, which is named Acetaldehyde or Ethanal.
Correct Answer: C — Acetaldehyde
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Q. What is the IUPAC name for the compound with the formula C2H5-CO-CH3?
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A.
2-Pentanone
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B.
3-Pentanone
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C.
Butan-2-one
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D.
Butan-3-one
Solution
The compound has a ketone functional group with 4 carbons, making it Butan-2-one.
Correct Answer: C — Butan-2-one
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