Hydrocarbons
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 bond angle around the carbon atoms in an alkyne?
A.
120 degrees
B.
180 degrees
C.
109.5 degrees
D.
90 degrees
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Solution
The bond angle around the carbon atoms in an alkyne is approximately 180 degrees due to linear geometry.
Correct Answer: B — 180 degrees
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Q. What is the effect of substituents on the reactivity of aromatic compounds in electrophilic substitution?
A.
All substituents deactivate the ring.
B.
Electron-donating groups activate the ring.
C.
Electron-withdrawing groups have no effect.
D.
All substituents direct to the meta position.
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Solution
Electron-donating groups activate the aromatic ring, making it more reactive towards electrophilic substitution.
Correct Answer: B — Electron-donating groups activate the ring.
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Q. What is the effect of substituents on the reactivity of aromatic compounds?
A.
All substituents are deactivating
B.
Some are activating and some are deactivating
C.
All are activating
D.
None affect reactivity
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Solution
Substituents can either activate or deactivate the aromatic ring towards electrophilic substitution, depending on their electron-donating or electron-withdrawing nature.
Correct Answer: B — Some are activating and some are deactivating
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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 general formula for alkenes?
A.
C_nH_(2n)
B.
C_nH_(2n+2)
C.
C_nH_(2n-2)
D.
C_nH_(2n+1)
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Solution
Alkenes are unsaturated hydrocarbons with the general formula CnH2n.
Correct Answer: A — C_nH_(2n)
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Q. What is the general formula for alkynes?
A.
C_nH_(2n+2)
B.
C_nH_(2n)
C.
C_nH_(2n-2)
D.
C_nH_(2n-1)
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Solution
The general formula for alkynes is C_nH_(2n-2), where n is the number of carbon atoms.
Correct Answer: C — C_nH_(2n-2)
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Q. What is the general formula for cycloalkanes?
A.
CnH2n
B.
CnH2n+2
C.
CnH2n-2
D.
CnH2n-4
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Solution
The general formula for cycloalkanes is CnH2n.
Correct Answer: A — CnH2n
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Q. What is the hybridization of carbon atoms in benzene?
A.
sp
B.
sp2
C.
sp3
D.
dsp2
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Solution
The carbon atoms in benzene are sp2 hybridized, forming a planar structure with 120-degree bond angles.
Correct Answer: B — sp2
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Q. What is the hybridization of the carbon atoms in alkenes?
A.
sp
B.
sp2
C.
sp3
D.
None of the above
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Solution
The carbon atoms in alkenes are sp2 hybridized due to the presence of a double bond.
Correct Answer: B — sp2
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Q. What is the hybridization of the carbon atoms in an alkyne?
A.
sp
B.
sp2
C.
sp3
D.
dsp3
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Solution
In alkynes, the carbon atoms involved in the triple bond are sp hybridized.
Correct Answer: A — sp
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Q. What is the hybridization of the carbon atoms in benzene?
A.
sp
B.
sp2
C.
sp3
D.
dsp3
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Solution
The carbon atoms in benzene are sp2 hybridized, forming a planar structure with 120-degree bond angles.
Correct Answer: B — sp2
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Q. What is the hybridization of the carbon atoms in ethylene (C2H4)?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
The carbon atoms in ethylene (C2H4) are sp2 hybridized due to the presence of a double bond.
Correct Answer: B — sp2
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Q. What is the hybridization of the carbon atoms in ethyne (C2H2)?
A.
sp
B.
sp2
C.
sp3
D.
dsp3
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Solution
In ethyne, the carbon atoms are sp hybridized due to the presence of a triple bond.
Correct Answer: A — sp
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Q. What is the hybridization of the carbon atoms involved in the double bond of alkenes?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
The carbon atoms in the double bond of alkenes are sp2 hybridized.
Correct Answer: B — sp2
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Q. What is the IUPAC name for CH3-CH2-CH=CH2?
A.
Butene
B.
Propene
C.
Butyne
D.
Pentene
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Solution
The IUPAC name for CH3-CH2-CH=CH2 is butene.
Correct Answer: A — Butene
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Q. What is the IUPAC name for the compound with the formula C3H8?
A.
Propene
B.
Propane
C.
Propyne
D.
Cyclopropane
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Solution
C3H8 is propane, which is an alkane.
Correct Answer: B — Propane
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Q. What is the IUPAC name of CH2=CH-CH2-CH3?
A.
1-Butene
B.
2-Butene
C.
Propene
D.
Butyne
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Solution
The correct IUPAC name for CH2=CH-CH2-CH3 is 1-Butene, as the double bond is at the first carbon.
Correct Answer: A — 1-Butene
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Q. What is the IUPAC name of CH3-CH2-CH2-CH3?
A.
Butane
B.
Propane
C.
Pentane
D.
Hexane
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Solution
The longest carbon chain has 4 carbons, so the IUPAC name is butane.
Correct Answer: A — Butane
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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 alkene with the formula C5H10?
A.
Pentene
B.
Butene
C.
Hexene
D.
Cyclopentene
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Solution
The IUPAC name of the alkene with the formula C5H10 is pentene.
Correct Answer: A — Pentene
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Q. What is the IUPAC name of the compound CH2=CH-CH2-CH3?
A.
Butene
B.
Propene
C.
1-Butene
D.
2-Butene
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Solution
The compound CH2=CH-CH2-CH3 is named 1-Butene as the double bond is between the first and second carbon.
Correct Answer: C — 1-Butene
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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 IUPAC name of the compound CH≡C-CH2-CH3?
A.
1-butyne
B.
2-butyne
C.
1-pentyne
D.
3-pentyne
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Solution
The IUPAC name of CH≡C-CH2-CH3 is 1-butyne.
Correct Answer: A — 1-butyne
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Q. What is the IUPAC name of the compound with the formula C4H6?
A.
1-butyne
B.
2-butyne
C.
Cyclobutene
D.
Butadiene
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Solution
The compound C4H6 is named 2-butyne according to IUPAC nomenclature.
Correct Answer: B — 2-butyne
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Q. What is the IUPAC name of the compound with the formula C6H5CH3?
A.
Toluene
B.
Benzaldehyde
C.
Phenol
D.
Aniline
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Solution
The compound C6H5CH3 is known as toluene, which is a methyl-substituted derivative of benzene.
Correct Answer: A — Toluene
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Q. What is the main feature of terminal alkynes?
A.
They have a triple bond in the middle
B.
They can form carbanions
C.
They are less acidic than alkenes
D.
They cannot undergo substitution reactions
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Solution
Terminal alkynes can form carbanions due to the acidity of the hydrogen atom attached to the sp-hybridized carbon.
Correct Answer: B — They can form carbanions
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Q. What is the main feature that distinguishes alkynes from alkenes?
A.
Presence of double bonds
B.
Presence of triple bonds
C.
Saturation
D.
Molecular weight
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Solution
Alkynes are distinguished from alkenes by the presence of triple bonds.
Correct Answer: B — Presence of triple bonds
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