ORGANIC CHEMISTRY I FINAL EXAM |quESTIONS ANd ANSwERS wITH
RATIONALES/GRAdEd A+/2026 updATE/100% CORRECT /INSTANT
dOwNLOAd
SECTION 1: BONDING AND STRUCTURE (Questions 1-15)
Question 1
What is the hybridization of the carbon atom in methane (CH₄)?
A) sp
B) sp²
C) sp³
D) sp³d
Correct Answer: C
Rationale: Methane has four sigma bonds and no lone pairs on carbon. The carbon
atom is sp³ hybridized with tetrahedral geometry (109.5° bond angles).
Question 2
What is the hybridization of the carbon atom in ethylene (C₂H₄)?
A) sp
B) sp²
C) sp³
D) sp³d
Correct Answer: B
,Rationale: Ethylene has a carbon-carbon double bond. Each carbon is sp² hybridized
with trigonal planar geometry (120° bond angles). The double bond consists of one
sigma (σ) bond and one pi (π) bond.
Question 3
What is the hybridization of the carbon atom in acetylene (C₂H₂)?
A) sp
B) sp²
C) sp³
D) sp³d
Correct Answer: A
Rationale: Acetylene has a carbon-carbon triple bond. Each carbon is sp hybridized with
linear geometry (180° bond angles). The triple bond consists of one sigma (σ) bond and
two pi (π) bonds.
Question 4
What is the bond angle in a tetrahedral carbon?
A) 90°
B) 109.5°
C) 120°
D) 180°
Correct Answer: B
Rationale: An sp³ hybridized carbon has a tetrahedral geometry with bond angles of
approximately 109.5°.
,Question 5
What is the bond angle in a trigonal planar carbon?
A) 90°
B) 109.5°
C) 120°
D) 180°
Correct Answer: C
Rationale: An sp² hybridized carbon has trigonal planar geometry with bond angles of
120°.
Question 6
What type of bond is formed by the side-to-side overlap of p orbitals?
A) Sigma (σ) bond
B) Pi (π) bond
C) Hydrogen bond
D) Ionic bond
Correct Answer: B
Rationale: A pi (π) bond is formed by the side-to-side (lateral) overlap of parallel p
orbitals. Pi bonds are present in double and triple bonds.
Question 7
What type of bond is formed by the end-to-end overlap of orbitals along the internuclear
axis?
, A) Sigma (σ) bond
B) Pi (π) bond
C) Hydrogen bond
D) Van der Waals bond
Correct Answer: A
Rationale: A sigma (σ) bond is formed by the end-to-end (axial) overlap of orbitals (s-s,
s-p, or p-p) along the internuclear axis. All single bonds are sigma bonds.
Question 8
Which of the following molecules contains a triple bond?
A) C₂H₄
B) C₂H₂
C) C₂H₆
D) CH₄
Correct Answer: B
Rationale: Acetylene (C₂H₂) contains a carbon-carbon triple bond. C₂H₄ has a double
bond. C₂H₆ and CH₄ have only single bonds.
Question 9
What is the formal charge on the oxygen atom in the hydronium ion (H₃O⁺)?
A) -1
B) 0
C) +1
D) +2
RATIONALES/GRAdEd A+/2026 updATE/100% CORRECT /INSTANT
dOwNLOAd
SECTION 1: BONDING AND STRUCTURE (Questions 1-15)
Question 1
What is the hybridization of the carbon atom in methane (CH₄)?
A) sp
B) sp²
C) sp³
D) sp³d
Correct Answer: C
Rationale: Methane has four sigma bonds and no lone pairs on carbon. The carbon
atom is sp³ hybridized with tetrahedral geometry (109.5° bond angles).
Question 2
What is the hybridization of the carbon atom in ethylene (C₂H₄)?
A) sp
B) sp²
C) sp³
D) sp³d
Correct Answer: B
,Rationale: Ethylene has a carbon-carbon double bond. Each carbon is sp² hybridized
with trigonal planar geometry (120° bond angles). The double bond consists of one
sigma (σ) bond and one pi (π) bond.
Question 3
What is the hybridization of the carbon atom in acetylene (C₂H₂)?
A) sp
B) sp²
C) sp³
D) sp³d
Correct Answer: A
Rationale: Acetylene has a carbon-carbon triple bond. Each carbon is sp hybridized with
linear geometry (180° bond angles). The triple bond consists of one sigma (σ) bond and
two pi (π) bonds.
Question 4
What is the bond angle in a tetrahedral carbon?
A) 90°
B) 109.5°
C) 120°
D) 180°
Correct Answer: B
Rationale: An sp³ hybridized carbon has a tetrahedral geometry with bond angles of
approximately 109.5°.
,Question 5
What is the bond angle in a trigonal planar carbon?
A) 90°
B) 109.5°
C) 120°
D) 180°
Correct Answer: C
Rationale: An sp² hybridized carbon has trigonal planar geometry with bond angles of
120°.
Question 6
What type of bond is formed by the side-to-side overlap of p orbitals?
A) Sigma (σ) bond
B) Pi (π) bond
C) Hydrogen bond
D) Ionic bond
Correct Answer: B
Rationale: A pi (π) bond is formed by the side-to-side (lateral) overlap of parallel p
orbitals. Pi bonds are present in double and triple bonds.
Question 7
What type of bond is formed by the end-to-end overlap of orbitals along the internuclear
axis?
, A) Sigma (σ) bond
B) Pi (π) bond
C) Hydrogen bond
D) Van der Waals bond
Correct Answer: A
Rationale: A sigma (σ) bond is formed by the end-to-end (axial) overlap of orbitals (s-s,
s-p, or p-p) along the internuclear axis. All single bonds are sigma bonds.
Question 8
Which of the following molecules contains a triple bond?
A) C₂H₄
B) C₂H₂
C) C₂H₆
D) CH₄
Correct Answer: B
Rationale: Acetylene (C₂H₂) contains a carbon-carbon triple bond. C₂H₄ has a double
bond. C₂H₆ and CH₄ have only single bonds.
Question 9
What is the formal charge on the oxygen atom in the hydronium ion (H₃O⁺)?
A) -1
B) 0
C) +1
D) +2
