The test for the presence of glucose with an aldehyde group is given to be found only in the open chain form but not in the cyclic form. This phenomenon is to be explained. Concept introduction: Carbohydrates are naturally occurring organic compounds. As the name implies carbohydrates are hydrates of carbon and have general formula of C X ( H 2 O ) Y . Basically, carbohydrates are polyhydroxy aldehyde and ketones , for examples, glucose and fructose. Glucose is a reducing sugar as it has an aldehyde group and its presence is detected by Tollen’s, Benedicts or Fehlings test. To determine: An explanation corresponding to the fact that the test for the presence of glucose with an aldehyde group is found only in the open chain form but not in the cyclic form.

Question

4. a) Give a suitable rationale for the following cyclization, stating the type of process involved (e.g. 9-endo-dig), clearly showing the mechanistic details at each step. H CO₂Me 1) NaOMe 2) H3O® CO₂Me

Answer 1

Question

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 98E

Interpretation Introduction

Interpretation: The test for the presence of glucose with an aldehyde group is given to be found only in the open chain form but not in the cyclic form. This phenomenon is to be explained.

Concept introduction: Carbohydrates are naturally occurring organic compounds. As the name implies carbohydrates are hydrates of carbon and have general formula of CX(H2O)Y . Basically, carbohydrates are polyhydroxy aldehyde and ketones, for examples, glucose and fructose. Glucose is a reducing sugar as it has an aldehyde group and its presence is detected by Tollen’s, Benedicts or Fehlings test.

To determine: An explanation corresponding to the fact that the test for the presence of glucose with an aldehyde group is found only in the open chain form but not in the cyclic form.

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4. a) Give a suitable rationale for the following cyclization, stating the type of process involved (e.g. 9-endo-dig), clearly showing the mechanistic details at each step. H CO₂Me 1) NaOMe 2) H3O® CO₂Me

2. Platinum and other group 10 metals often act as solid phase hydrogenation catalysts for unsaturated hydrocarbons such as propylene, CH3CHCH2. In order for the reaction to be catalyzed the propylene molecules must first adsorb onto the surface. In order to completely cover the surface of a piece of platinum that has an area of 1.50 cm² with propylene, a total of 3.45 x 10¹7 molecules are needed. Determine the mass of the propylene molecules that have been absorbed onto the platinum surface.

Chem 141, Dr. Haefner 2. (a) Many main group oxides form acidic solutions when added to water. For example solid tetraphosphorous decaoxide reacts with water to produce phosphoric acid. Write a balanced chemical equation for this reaction. (b) Calcium phosphate reacts with silicon dioxide and carbon graphite at elevated temperatures to produce white phosphorous (P4) as a gas along with calcium silicate (Silcate ion is SiO3²-) and carbon monoxide. Write a balanced chemical equation for this reaction.

Answer 2

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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 98E

Interpretation Introduction

Interpretation: The test for the presence of glucose with an aldehyde group is given to be found only in the open chain form but not in the cyclic form. This phenomenon is to be explained.

Concept introduction: Carbohydrates are naturally occurring organic compounds. As the name implies carbohydrates are hydrates of carbon and have general formula of CX(H2O)Y . Basically, carbohydrates are polyhydroxy aldehyde and ketones, for examples, glucose and fructose. Glucose is a reducing sugar as it has an aldehyde group and its presence is detected by Tollen’s, Benedicts or Fehlings test.

To determine: An explanation corresponding to the fact that the test for the presence of glucose with an aldehyde group is found only in the open chain form but not in the cyclic form.

Expert Solution & Answer

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Check out sample textbook solution

Answer 3

Question

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 98E

Interpretation Introduction

Interpretation: The test for the presence of glucose with an aldehyde group is given to be found only in the open chain form but not in the cyclic form. This phenomenon is to be explained.

Concept introduction: Carbohydrates are naturally occurring organic compounds. As the name implies carbohydrates are hydrates of carbon and have general formula of CX(H2O)Y . Basically, carbohydrates are polyhydroxy aldehyde and ketones, for examples, glucose and fructose. Glucose is a reducing sugar as it has an aldehyde group and its presence is detected by Tollen’s, Benedicts or Fehlings test.

To determine: An explanation corresponding to the fact that the test for the presence of glucose with an aldehyde group is found only in the open chain form but not in the cyclic form.

Expert Solution & Answer

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See solution

Check out sample textbook solution

Answer 4

Question

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 98E

Interpretation Introduction