Q. How many isomers does C4H10 have?
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Solution
C4H10 has 2 structural isomers: n-butane and isobutane.
Correct Answer: B — 2
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Q. How many isomers does C5H12 have?
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Solution
C5H12 has 3 structural isomers: pentane, isopentane, and neopentane.
Correct Answer: C — 4
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Q. What is the general formula for alkanes?
A.
C_nH_(2n)
B.
C_nH_(2n+2)
C.
C_nH_(2n-2)
D.
C_nH_(n)
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Solution
The general formula for alkanes is C_nH_(2n+2).
Correct Answer: B — C_nH_(2n+2)
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Q. What is the IUPAC name of the alkane with the formula C5H12?
A.
Pentane
B.
Butane
C.
Hexane
D.
Propane
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Solution
The alkane with the formula C5H12 is named Pentane.
Correct Answer: A — Pentane
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Q. What is the IUPAC name of the alkane with the formula C6H14?
A.
Hexane
B.
Pentane
C.
Heptane
D.
Octane
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Solution
The alkane with the formula C6H14 is named Hexane.
Correct Answer: A — Hexane
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Q. What is the IUPAC name of the compound CH3-CH2-CH2-CH3?
A.
Butane
B.
Propane
C.
Pentane
D.
Hexane
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Solution
The IUPAC name for CH3-CH2-CH2-CH3 is Butane.
Correct Answer: A — Butane
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Q. What is the main product of the complete combustion of alkanes?
A.
Carbon monoxide
B.
Carbon dioxide
C.
Water
D.
Oxygen
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Solution
The main products of the complete combustion of alkanes are carbon dioxide and water.
Correct Answer: B — Carbon dioxide
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Q. What is the main source of alkanes?
A.
Coal
B.
Natural gas
C.
Petroleum
D.
Biomass
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Solution
The main source of alkanes is petroleum, which contains a mixture of hydrocarbons.
Correct Answer: C — Petroleum
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Q. What is the primary type of reaction that alkanes undergo?
A.
Addition
B.
Substitution
C.
Elimination
D.
Condensation
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Solution
Alkanes primarily undergo substitution reactions.
Correct Answer: B — Substitution
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Q. What is the structural formula for 2-methylpropane?
A.
CH3-CH2-CH(CH3)-CH3
B.
CH3-CH(CH3)-CH2-CH3
C.
CH3-CH2-CH2-CH3
D.
CH3-CH2-CH(CH2)-CH3
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Solution
The structural formula for 2-methylpropane is CH3-CH(CH3)-CH2-CH3.
Correct Answer: B — CH3-CH(CH3)-CH2-CH3
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Q. What is the structural formula for hexane?
A.
C6H14
B.
C5H12
C.
C4H10
D.
C3H8
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Solution
The structural formula for hexane is C6H14.
Correct Answer: A — C6H14
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Q. What is the structural formula of 2-methylpropane?
A.
CH3-CH2-CH(CH3)-CH3
B.
CH3-CH(CH3)-CH2-CH3
C.
CH3-CH2-CH2-CH3
D.
CH3-CH2-CH(CH2)-CH3
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Solution
The structural formula of 2-methylpropane is CH3-CH(CH3)-CH2-CH3.
Correct Answer: B — CH3-CH(CH3)-CH2-CH3
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Q. What is the structural formula of propane?
A.
C3H8
B.
C2H6
C.
C4H10
D.
C5H12
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Solution
The structural formula of propane is C3H8, indicating three carbon atoms.
Correct Answer: A — C3H8
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Q. What type of bonding is present in alkanes?
A.
Ionic bonding
B.
Covalent bonding
C.
Metallic bonding
D.
Hydrogen bonding
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Solution
Alkanes are characterized by covalent bonding between carbon and hydrogen atoms.
Correct Answer: B — Covalent bonding
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Q. What type of hybridization is present in the carbon atoms of alkanes?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
The carbon atoms in alkanes are sp3 hybridized.
Correct Answer: C — sp3
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Q. What type of reaction do alkanes typically undergo?
A.
Addition
B.
Substitution
C.
Elimination
D.
Hydrolysis
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Solution
Alkanes typically undergo substitution reactions, especially with halogens.
Correct Answer: B — Substitution
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Q. Which alkane is used as a fuel in lighters?
A.
Methane
B.
Ethane
C.
Butane
D.
Propane
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Solution
Butane is commonly used as a fuel in lighters.
Correct Answer: C — Butane
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Q. Which alkane is used as a refrigerant?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Propane is commonly used as a refrigerant due to its favorable thermodynamic properties.
Correct Answer: C — Propane
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Q. Which of the following alkanes has a branched structure?
A.
Butane
B.
Pentane
C.
Isobutane
D.
Hexane
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Solution
Isobutane is a branched alkane.
Correct Answer: C — Isobutane
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Q. Which of the following alkanes has a higher density than water?
A.
Ethane
B.
Propane
C.
Butane
D.
Pentane
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Solution
Butane has a higher density than water.
Correct Answer: C — Butane
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Q. Which of the following alkanes has a molecular weight closest to 72 g/mol?
A.
C5H12
B.
C6H14
C.
C7H16
D.
C8H18
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Solution
C6H14 (hexane) has a molecular weight of approximately 86 g/mol, while C7H16 (heptane) has a molecular weight of approximately 100 g/mol. The closest is C6H14.
Correct Answer: B — C6H14
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Q. Which of the following alkanes has the highest boiling point?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Butane has the highest boiling point among the given alkanes due to its larger molecular size.
Correct Answer: D — Butane
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Q. Which of the following alkanes has the lowest density?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Methane has the lowest density among the given alkanes.
Correct Answer: A — Methane
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Q. Which of the following alkanes has the lowest molecular weight?
A.
Butane
B.
Propane
C.
Ethane
D.
Methane
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Solution
Methane (CH4) has the lowest molecular weight among the given alkanes.
Correct Answer: D — Methane
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Q. Which of the following alkanes is a gas at room temperature?
A.
Hexane
B.
Octane
C.
Decane
D.
Methane
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Solution
Methane is a gas at room temperature.
Correct Answer: D — Methane
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Q. Which of the following alkanes is branched?
A.
Butane
B.
Pentane
C.
Isobutane
D.
Hexane
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Solution
Isobutane is a branched alkane, while butane, pentane, and hexane are straight-chain alkanes.
Correct Answer: C — Isobutane
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Q. Which of the following alkanes is the least branched?
A.
2-Methylbutane
B.
3-Methylpentane
C.
Butane
D.
Hexane
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Solution
Butane is the least branched alkane among the options.
Correct Answer: C — Butane
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Q. Which of the following alkanes is the least soluble in water?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Methane is the least soluble in water due to its nonpolar nature.
Correct Answer: A — Methane
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Q. Which of the following is a branched alkane?
A.
Pentane
B.
Isopentane
C.
Hexane
D.
Heptane
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Solution
Isopentane is a branched alkane, while the others are straight-chain alkanes.
Correct Answer: B — Isopentane
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Q. Which of the following is a branched-chain alkane?
A.
Pentane
B.
2-Methylbutane
C.
Hexane
D.
Heptane
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Solution
2-Methylbutane is a branched-chain alkane derived from butane.
Correct Answer: B — 2-Methylbutane
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