The stereoisomers formed from the cyclization of both A and B , are to be drawn, and an explanation for an optically inactive product mixture from A and an optically active product mixture from B is to be stated. Concept introduction: The formation of a cyclic hemiacetal is an acid catalyzed reaction. The cyclic hemiacetals formed by the intramolecular cyclization of hydroxyl aldehydes . This process leads to the formation of equal amount of hemiacetal enantiomers with a new stereogenic center.

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 21, Problem 21.49P

Interpretation Introduction

Interpretation: The stereoisomers formed from the cyclization of both A and B, are to be drawn, and an explanation for an optically inactive product mixture from A and an optically active product mixture from B is to be stated.

Concept introduction: The formation of a cyclic hemiacetal is an acid catalyzed reaction. The cyclic hemiacetals formed by the intramolecular cyclization of hydroxyl aldehydes. This process leads to the formation of equal amount of hemiacetal enantiomers with a new stereogenic center.

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MISSED THIS? Read Section 19.9 (Pages 878-881); Watch IWE 19.10 Consider the following reaction: CH3OH(g) CO(g) + 2H2(g) (Note that AG,CH3OH(g) = -162.3 kJ/mol and AG,co(g)=-137.2 kJ/mol.) Part A Calculate AG for this reaction at 25 °C under the following conditions: PCH₂OH Pco PH2 0.815 atm = 0.140 atm 0.170 atm Express your answer in kilojoules to three significant figures. Ο ΑΣΦ AG = -150 Submit Previous Answers Request Answer □? kJ × Incorrect; Try Again; 2 attempts remaining Calculate the free energy change under nonstandard conditions (AGrxn) by using the following relationship: AGrxn = AGrxn + RTInQ, AGxn+RTInQ, where AGxn is the standard free energy change, R is the ideal gas constant, T is the temperature in kelvins, a is the reaction quotient. Provide Feedback Next >

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 21, Problem 21.49P

Interpretation Introduction

Interpretation: The stereoisomers formed from the cyclization of both A and B, are to be drawn, and an explanation for an optically inactive product mixture from A and an optically active product mixture from B is to be stated.

Concept introduction: The formation of a cyclic hemiacetal is an acid catalyzed reaction. The cyclic hemiacetals formed by the intramolecular cyclization of hydroxyl aldehydes. This process leads to the formation of equal amount of hemiacetal enantiomers with a new stereogenic center.

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Answer 3

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 21, Problem 21.49P

Interpretation Introduction

Interpretation: The stereoisomers formed from the cyclization of both A and B, are to be drawn, and an explanation for an optically inactive product mixture from A and an optically active product mixture from B is to be stated.

Concept introduction: The formation of a cyclic hemiacetal is an acid catalyzed reaction. The cyclic hemiacetals formed by the intramolecular cyclization of hydroxyl aldehydes. This process leads to the formation of equal amount of hemiacetal enantiomers with a new stereogenic center.

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Answer 4

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 21, Problem 21.49P

Interpretation Introduction