a) Interpretation: The structure of threonine is to be elucidated using normal wedged and dashed line and the presence of two α-carbons in this amino acid gives it two chirality centers. Concept introduction: (2S,3R)-2-amino-3-hydroxybutanoic acid or threonine is an amino acid with two α-carbons and hence it has two chiral centers. According to the Fisher projections, the amino acid molecules may be represented using normal, wedged, and dashed lines. To determine: The structure of L-threonine using normal, wedged and dashed lines.

Question

Using the conditions of spontaneity to deduce the signs of AH and AS Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction observations conclusions A This reaction is always spontaneous, but proceeds slower at temperatures above 120. °C. ΔΗ is (pick one) AS is (pick one) ΔΗ is (pick one) B This reaction is spontaneous except above 117. °C. AS is (pick one) ΔΗ is (pick one) This reaction is slower below 20. °C than C above. AS is |(pick one) ? 18 Ar 1

Answer 1

Question

Chapter 26.1, Problem 3P

Interpretation Introduction

a)

Interpretation:

The structure of threonine is to be elucidated using normal wedged and dashed line and the presence of two α-carbons in this amino acid gives it two chirality centers.

Concept introduction:

(2S,3R)-2-amino-3-hydroxybutanoic acid or threonine is an amino acid with two α-carbons and hence it has two chiral centers. According to the Fisher projections, the amino acid molecules may be represented using normal, wedged, and dashed lines.

To determine:

The structure of L-threonine using normal, wedged and dashed lines.

Interpretation Introduction

b)

Interpretation:

The structure of threonine is to be elucidated using normal wedged and dashed line and the presence of two α-carbons in this amino acid gives it two chirality centers.

Concept introduction:

(2S,3R)-2-amino-3-hydroxybutanoic acid or threonine is an amino acid with two α-carbons and hence it has two chiral centers. According to the Fisher projections, the amino acid molecules may be represented using normal, wedged, and dashed lines.

To determine:

Two possible diastereomers of L-threonine.

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