Organic Chemistry
Q. What is the effect of increasing the size of the halogen atom on the reactivity of haloalkanes?
A.
Increases reactivity
B.
Decreases reactivity
C.
No effect
D.
Depends on the solvent
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Solution
Increasing the size of the halogen atom generally increases the reactivity of haloalkanes due to the weaker C-X bond.
Correct Answer: A — Increases reactivity
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Q. What is the effect of increasing the size of the halogen in haloalkanes on the bond strength?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Varies randomly
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Solution
As the size of the halogen increases, the bond strength decreases due to the longer bond length and weaker overlap.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the steric hindrance on the reactivity of aldehydes and ketones?
A.
Increases reactivity
B.
Decreases reactivity
C.
No effect
D.
Reactivity depends on solvent
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Solution
Increasing steric hindrance decreases the reactivity of ketones compared to aldehydes.
Correct Answer: B — Decreases reactivity
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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 effect of the +M effect on the stability of a carbocation?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
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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?
A.
Increases acidity
B.
Decreases acidity
C.
No effect on acidity
D.
Depends on the solvent
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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?
A.
Increases acidity
B.
Decreases acidity
C.
No effect on acidity
D.
Depends on the solvent
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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?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
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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
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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 function of hemoglobin in the body?
A.
To catalyze reactions
B.
To transport oxygen
C.
To provide structural support
D.
To store energy
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Solution
Hemoglobin is a protein that functions to transport oxygen from the lungs to tissues throughout the body.
Correct Answer: B — To transport oxygen
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Q. What is the functional group present in alcohols?
A.
Aldehyde
B.
Ketone
C.
Hydroxyl
D.
Carboxylic acid
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Solution
Alcohols contain a hydroxyl (-OH) functional group.
Correct Answer: C — Hydroxyl
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Q. What is the functional group present in carboxylic acids?
A.
Hydroxyl group
B.
Carbonyl group
C.
Carboxyl group
D.
Amino group
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Solution
Carboxylic acids contain the carboxyl group (-COOH), which is the defining feature of this class of compounds.
Correct Answer: C — Carboxyl group
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Q. What is the functional group present in ketones?
A.
-CHO
B.
-CO-
C.
-OH
D.
-C=O
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Solution
Ketones contain the functional group -CO- (carbonyl group) between two carbon atoms.
Correct Answer: B — -CO-
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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 carbohydrates?
A.
C_n(H2O)_n
B.
C_nH_nO_n
C.
C_nH_2nO_n
D.
C_nH_2O_n
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Solution
The general formula for carbohydrates is C_n(H2O)_n, indicating that they are hydrates of carbon.
Correct Answer: A — C_n(H2O)_n
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Q. What is the general formula for carboxylic acids?
A.
C_nH_2nO_2
B.
C_nH_2n+1COOH
C.
C_nH_2nO
D.
C_nH_2n+2O
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Solution
The general formula for carboxylic acids is C_nH_2nO_2.
Correct Answer: A — C_nH_2nO_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 general formula for ketones?
A.
CnH2nO
B.
CnH2n+2O
C.
CnH2n-2O
D.
CnH2nO2
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Solution
The general formula for ketones is CnH2nO, where n is the number of carbon atoms.
Correct Answer: A — CnH2nO
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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 nitrogen in a primary amine?
A.
sp
B.
sp2
C.
sp3
D.
None of the above
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Solution
The nitrogen in a primary amine is sp3 hybridized.
Correct Answer: C — sp3
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Q. What is the hybridization of nitrogen in amines?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
Nitrogen in amines is sp3 hybridized due to the presence of three substituents and a lone pair.
Correct Answer: C — sp3
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Q. What is the hybridization of the carbon atom in ethylene (C2H4)?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
In ethylene, each carbon atom is sp2 hybridized, forming a double bond with the other carbon.
Correct Answer: B — sp2
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Q. What is the hybridization of the carbon atom in ethyne (C2H2)?
A.
sp
B.
sp2
C.
sp3
D.
dsp3
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Solution
The carbon atoms in ethyne (C2H2) are sp hybridized due to the triple bond between them.
Correct Answer: A — sp
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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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