Q. Which of the following compounds is a strong acid?
A.
H2O
B.
H2SO4
C.
H2O2
D.
NH3
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Solution
H2SO4 (sulfuric acid) is a strong acid, while H2O is neutral, H2O2 is a weak oxidizer, and NH3 is a weak base.
Correct Answer: B — H2SO4
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Q. Which of the following compounds is a strong activating group for electrophilic aromatic substitution?
A.
-NO2
B.
-CN
C.
-OH
D.
-COOH
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Solution
The -OH group is a strong activating group due to its ability to donate electron density to the aromatic ring.
Correct Answer: C — -OH
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Q. Which of the following compounds is a stronger electrophile in electrophilic aromatic substitution?
A.
Benzene
B.
Nitrobenzene
C.
Toluene
D.
Chlorobenzene
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Solution
Toluene is a stronger electrophile due to the electron-donating effect of the methyl group.
Correct Answer: C — Toluene
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Q. Which of the following compounds is a structural isomer of butane?
A.
2-methylpropane
B.
1-butene
C.
Cyclobutane
D.
Pentane
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Solution
2-methylpropane is a structural 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 compounds is a structural isomer of C4H10?
A.
2-methylpropane
B.
butane
C.
cyclobutane
D.
1-butyne
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Solution
2-methylpropane is a structural isomer of butane, both having the same molecular formula C4H10.
Correct Answer: A — 2-methylpropane
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Q. Which of the following compounds is an alkane?
A.
C2H4
B.
C3H6
C.
C4H10
D.
C5H8
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Solution
C4H10 is an alkane, as it follows the formula CnH2n+2, where n=4.
Correct Answer: C — C4H10
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Q. Which of the following compounds is an ester?
A.
CH3COOCH2CH3
B.
CH3CHO
C.
C2H5OH
D.
CH3COOH
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Solution
The compound CH3COOCH2CH3 contains an ester functional group, characterized by the -COO- linkage.
Correct Answer: A — CH3COOCH2CH3
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Q. Which of the following compounds is an ether?
A.
C2H5OH
B.
C6H5OH
C.
C2H5OC2H5
D.
C3H7OH
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Solution
C2H5OC2H5 is an ether, characterized by an oxygen atom connected to two alkyl or aryl groups.
Correct Answer: C — C2H5OC2H5
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Q. Which of the following compounds is an example of a coordination compound?
A.
NaCl
B.
CuSO4
C.
Ag(NH3)2Cl
D.
H2O
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Solution
Ag(NH3)2Cl is a coordination compound with a central silver ion coordinated to two ammonia ligands.
Correct Answer: C — Ag(NH3)2Cl
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Q. Which of the following compounds is an example of a cycloalkane?
A.
C6H12
B.
C5H10
C.
C4H8
D.
C3H6
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Solution
Cycloalkanes are saturated hydrocarbons with a ring structure. C6H12 represents cyclohexane, which is a cycloalkane.
Correct Answer: A — C6H12
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Q. Which of the following compounds is an example of a hydrogen halide?
A.
H2O
B.
HCl
C.
NH3
D.
CH4
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Solution
Hydrochloric acid (HCl) is an example of a hydrogen halide, which consists of hydrogen and a halogen.
Correct Answer: B — HCl
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Q. Which of the following compounds is an example of a meso compound?
A.
2,3-butanediol
B.
1,2-dichloropropane
C.
2-pentene
D.
3-hexanol
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Solution
2,3-butanediol has two chiral centers but is superimposable on its mirror image, making it a meso compound.
Correct Answer: A — 2,3-butanediol
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Q. Which of the following compounds is an example of a p-block element?
A.
NaCl
B.
SiO2
C.
Mg(OH)2
D.
Fe2O3
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Solution
SiO2 contains silicon, which is a p-block element in group 14 of the periodic table.
Correct Answer: B — SiO2
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Q. Which of the following compounds is an example of a para-substituted aromatic compound?
A.
Toluene
B.
p-Dichlorobenzene
C.
Aniline
D.
Phenol
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Solution
p-Dichlorobenzene has two chlorine substituents located at the para positions relative to each other on the benzene ring.
Correct Answer: B — p-Dichlorobenzene
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Q. Which of the following compounds is an example of a phenolic compound?
A.
Benzene
B.
Phenol
C.
Toluene
D.
Aniline
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Solution
Phenol is a classic example of a phenolic compound, characterized by a hydroxyl group (-OH) attached to a benzene ring.
Correct Answer: B — Phenol
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Q. Which of the following compounds is an example of a polycyclic aromatic hydrocarbon?
A.
Naphthalene
B.
Benzaldehyde
C.
Toluene
D.
Phenol
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Solution
Naphthalene is a polycyclic aromatic hydrocarbon, consisting of two fused benzene rings.
Correct Answer: A — Naphthalene
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Q. Which of the following compounds is an example of a racemic mixture?
A.
Lactic acid
B.
2-butanol
C.
Glucose
D.
Tartaric acid
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Solution
Lactic acid can exist as two enantiomers, and a racemic mixture contains equal amounts of both.
Correct Answer: A — Lactic acid
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Q. Which of the following compounds is an example of a terminal alkyne?
A.
1-butyne
B.
2-butyne
C.
1-pentyne
D.
Cyclopentene
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Solution
1-butyne is a terminal alkyne because the triple bond is at the end of the carbon chain.
Correct Answer: A — 1-butyne
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Q. Which of the following compounds is an example of an ester?
A.
Ethyl acetate
B.
Butan-1-ol
C.
Acetic acid
D.
Propanoic acid
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Solution
Ethyl acetate is formed from the reaction of ethanol and acetic acid, making it an ester. The other options are either alcohols or acids.
Correct Answer: A — Ethyl acetate
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Q. Which of the following compounds is formed when hydrogen reacts with chlorine?
A.
Hydrochloric acid
B.
Hydrogen chloride
C.
Chlorine gas
D.
Hydrogen peroxide
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Solution
When hydrogen reacts with chlorine, it forms hydrogen chloride (HCl), which is a gas at room temperature.
Correct Answer: B — Hydrogen chloride
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Q. Which of the following compounds is least reactive towards electrophilic substitution?
A.
Benzene
B.
Toluene
C.
Nitrobenzene
D.
Anisole
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Solution
Nitrobenzene is least reactive towards electrophilic substitution due to the strong electron-withdrawing effect of the nitro group, which deactivates the ring.
Correct Answer: C — Nitrobenzene
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Q. Which of the following compounds is most likely to undergo an E1 reaction?
A.
1-bromobutane
B.
2-bromobutane
C.
3-bromobutane
D.
1-bromo-2-methylpropane
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Solution
3-bromobutane is most likely to undergo an E1 reaction due to the stability of the tertiary carbocation formed during the reaction.
Correct Answer: C — 3-bromobutane
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Q. Which of the following compounds is most reactive towards electrophilic substitution?
A.
Toluene
B.
Benzene
C.
Chlorobenzene
D.
Nitrobenzene
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Solution
Toluene is most reactive due to the electron-donating effect of the methyl group, which activates the ring towards electrophilic substitution.
Correct Answer: A — Toluene
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Q. Which of the following compounds is the most reactive towards electrophilic substitution?
A.
Benzene
B.
Toluene
C.
Chlorobenzene
D.
Nitrobenzene
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Solution
Toluene is the most reactive due to the electron-donating effect of the methyl group, which activates the ring towards electrophilic substitution.
Correct Answer: B — Toluene
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Q. Which of the following compounds undergoes an SN1 reaction mechanism?
A.
1-bromopropane
B.
2-bromopropane
C.
3-bromopropane
D.
Bromobenzene
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Solution
3-bromopropane is a tertiary alkyl halide, which favors the SN1 mechanism due to the stability of the carbocation formed.
Correct Answer: C — 3-bromopropane
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Q. Which of the following compounds undergoes an SN1 reaction most readily?
A.
1-bromopropane
B.
2-bromopropane
C.
3-bromopropane
D.
1-bromo-2-methylpropane
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Solution
Tertiary alkyl halides like 3-bromopropane stabilize the carbocation intermediate formed during the SN1 mechanism, making them more reactive.
Correct Answer: C — 3-bromopropane
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Q. Which of the following compounds undergoes an S_N1 reaction mechanism?
A.
1-bromopropane
B.
2-bromopropane
C.
3-bromopropane
D.
Bromobenzene
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Solution
S_N1 reactions are favored by tertiary substrates due to the stability of the carbocation intermediate formed.
Correct Answer: C — 3-bromopropane
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Q. Which of the following compounds undergoes an S_N2 reaction most readily?
A.
1-bromopropane
B.
2-bromopropane
C.
3-bromopropane
D.
Benzyl bromide
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Solution
1-bromopropane undergoes S_N2 reactions most readily due to less steric hindrance compared to secondary and tertiary halides.
Correct Answer: A — 1-bromopropane
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Q. Which of the following compounds undergoes electrophilic substitution more readily than benzene?
A.
Toluene
B.
Cyclohexane
C.
Phenol
D.
Naphthalene
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Solution
Phenol is more reactive than benzene due to the electron-donating effect of the hydroxyl group, which stabilizes the carbocation intermediate.
Correct Answer: C — Phenol
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Q. Which of the following compounds undergoes electrophilic substitution more readily?
A.
Toluene
B.
Benzene
C.
Chlorobenzene
D.
Nitrobenzene
Show solution
Solution
Toluene undergoes electrophilic substitution more readily than benzene due to the electron-donating effect of the methyl group, which stabilizes the carbocation intermediate.
Correct Answer: A — Toluene
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