Which of the statements below is TRUE? Group of answer choices A tertiary (30) amine has one H-bond acceptor in the acid form. An ether cannot form a H-bond with a primary (10) alcohol. A thiol has three H-bond donors in the base form. The number of H-bond donors in an aldehyde depends on the pH of the solution. A tertiary amide cannot form a H-bond with a sulfide.

Identify the circled functional groups and linkages in the compound shown below.

In the following monosaccharide hemiacetal, identify the anomeric carbon atom. Identify the appropriate atom by selecting an atom and assigning it a map number of 1. To do this, rigl mark to enable the Map field before entering a value. H: 122 EXP" CONT. 0 0 H но OH S Br OH [1] ÓH P. -

Please note the image question below. CH₂OH ç-o CH₂OPO Dihydroxyacetone phosphate triose phosphate isomerase O True O False H HCOH CH₂OPO Glyceraldehyde 3-phosphate This is a change in configuration because isomers can only be interconverted by temporarily breaking covalent bonds.

Below is a representation of glutamic acid with three incomplete functional groups in dashed boxes labeled A, B, and C. From the drop down menus choose the correct form of each chemical group that completes the structure of glutamic acid at pH =1. A COO H-C-CH₂-CH₂-COO N C A [Select] B [Select] B C [Select]

1. Rank the following amines from lowest to highest boiling point. Explain your reasoning. CH3 CH2CH3 H3C CH3 ༣.མིའི་ན་བྱིན་ CH NH₂ -CH3 H₂ NH2 2. Which compound in each pair would have the higher boiling point? Why? a. H3C CH3 H3C OH b. NH2 CH3 H₂ H3C CH CH CH3 H3C -CH3 NH2 3. Circle each of the following molecules that would be significantly soluble in water. Explain. ΝΗΣ H₂ H₂ H₂ H₂ CH C- NH₂ H3C -CH3 H3C H2 H₂ CH3 CH CH3 H3C -CH3 H3C H₂

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Which of these statements about the tertiary structure of a polypeptide is(are) untrue? You may select more than one answer. The tertiary structure will be maintained when the solvent is changed from pure water to aqueous acetic acid. O The tertiary structure is determined in part by the formation of disulfide bridges. Hydrogen bonding interactions are responsible for formation of secondary structure but not tertiary structure, O The tertiary structure is rigid and unchanging. O Charge-charge (electrostatic) interactions can be important in the tertiary structure.

Choose the correct structure for thiamine hydrochloride at pH 10. H3C H3C N NH₂ NH₂ CI- A CI- с CH3 CH3 HCI -OH OO H3C H3C N NH3 NH₂ CI- B D CH3 S CH3 S HCI OH -OH

Draw the structure(s) of the major organic product(s) of the following reaction. + Ясна 1. dioxane/25° CH3 2. aqueous acetic acid / reflux You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • Do not include the amine from which the enamine was derived. • If no reaction occurs, draw the organic starting material. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate multiple products using the + sign from the drop-down menu. •