PQ-11. Rank these compounds from lowest to highest energy. C(CH3)3 C(CH3)3 (A) I

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PQ-11. Rank these compounds from lowest to highest energy.
C(CH3)3
C(CH3)3
(A) I<II<III
H3C
I
(B) III <II <I
CH3
II
49
H₂CH₂C
(C) II <III<I
C(CH3)3
(D) II<I<III
Transcribed Image Text:PQ-11. Rank these compounds from lowest to highest energy. C(CH3)3 C(CH3)3 (A) I<II<III H3C I (B) III <II <I CH3 II 49 H₂CH₂C (C) II <III<I C(CH3)3 (D) II<I<III
What structure is identical to this molecule?
(A)
H3C
(A)
CH3
OH
H3C
(B)
(A)
(B)
H₂C
PQ-14. Which compound has the IUPAC name trans-1-chloro-3-ethylcyclohexane?
CI
CI
(A) I and II
(B)
CH3
OH
PQ-13. What best describes the most stable conformation of trans-1-isopropyl-3-methylcyclohexane?
(A) The isopropyl group is equatorial, and the methyl group is axial.
(B) The isopropyl group is axial, and the methyl group is equatorial.
(C) Both the isopropyl and methyl groups are equatorial.
(D) Both the isopropyl and methyl groups are axial.
PQ-18. Which is/are optically inactive?
H
CH3
H
PQ-16. Which value is closest to the internal C-C-C bond angle in cyclohexane?
(A) 90⁰
(B) 100°
(C) 110⁰
OH
к он
CH3
(C)
CH3
I
(B) II only
H.
(C)
HO
50
H3C
PQ-15. What factor is responsible for a greater heat of combustion per CH₂ for cyclopropane than the heat of
combustion per CH₂ for cyclohexane.
(A) Cyclohexane has a different hydrogen-to-carbon atom ratio than cyclopropane.
(B) Cyclohexane has greater ring strain than cyclopropane.
(C) Cyclopropane is a strained ring relative to cyclohexane.
(D) Cyclohexane has more carbon atoms than cyclopropane.
(C)
CH3
HO
CH3
PQ-17. Which molecules would have the highest heat of combustion, or release most energy when burned to
produce CO₂ and H₂O?
OH
OH
H
CH3
CI
CH3
II
(C) III only
CH3
(D)
III
H-OH
H
H - OH
CH 3
III
H
(D)
CH3
H3C
(D)
CH₂CH3
H3C
(D) 120°
CH 3
OH
(D) II and III
CI
Transcribed Image Text:What structure is identical to this molecule? (A) H3C (A) CH3 OH H3C (B) (A) (B) H₂C PQ-14. Which compound has the IUPAC name trans-1-chloro-3-ethylcyclohexane? CI CI (A) I and II (B) CH3 OH PQ-13. What best describes the most stable conformation of trans-1-isopropyl-3-methylcyclohexane? (A) The isopropyl group is equatorial, and the methyl group is axial. (B) The isopropyl group is axial, and the methyl group is equatorial. (C) Both the isopropyl and methyl groups are equatorial. (D) Both the isopropyl and methyl groups are axial. PQ-18. Which is/are optically inactive? H CH3 H PQ-16. Which value is closest to the internal C-C-C bond angle in cyclohexane? (A) 90⁰ (B) 100° (C) 110⁰ OH к он CH3 (C) CH3 I (B) II only H. (C) HO 50 H3C PQ-15. What factor is responsible for a greater heat of combustion per CH₂ for cyclopropane than the heat of combustion per CH₂ for cyclohexane. (A) Cyclohexane has a different hydrogen-to-carbon atom ratio than cyclopropane. (B) Cyclohexane has greater ring strain than cyclopropane. (C) Cyclopropane is a strained ring relative to cyclohexane. (D) Cyclohexane has more carbon atoms than cyclopropane. (C) CH3 HO CH3 PQ-17. Which molecules would have the highest heat of combustion, or release most energy when burned to produce CO₂ and H₂O? OH OH H CH3 CI CH3 II (C) III only CH3 (D) III H-OH H H - OH CH 3 III H (D) CH3 H3C (D) CH₂CH3 H3C (D) 120° CH 3 OH (D) II and III CI
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