The pro-R or pro-S hydrogen removed from citrate during the dehydration in step 2 of the citric acid cycle. Concept introduction: A molecule is said to be pro chiral, if it can be converted from achiral to chiral a single chemical step. For instance, an unsymmetrical ketone like 2-butanone is pro chiral because it can be converted to the chiral alcohol 2-butanol, by the addition of hydrogen. Which enantiomer of 2-butanol is produced depends on which face of the planar carbonyl undergoes reaction to distinguish between the possibilities, the stereo chemical description Re and Si (announced ‘ray’ and ‘sigh’) are used. The concept of this designation is as follows: Rank the three groups attached to the trigonal, sp 2 hybridized carbon according to the conventional Cahn-In gold-Prelog (CIP) system and imagine curved among from the highest to second highest, to third highest ranked substituents.

Question

The reaction for obtaining NO2 from NO and O2 has the rate equation: v = k[NO]2[O2]. Indicate which of the following options is correct.(A). This rate equation is inconsistent with the reaction consisting of a single trimolecular step.(B). Since the overall order is 3, the reaction must necessarily have some trimolecular step in its mechanism.(C). A two-step mechanism: 1) NO + NO ⇄ N2O2 (fast); 2) N2O2 + O2 → NO2 + NO2 (slow).(D). The mechanism must necessarily consist of three unimolecular elementary steps with very similar rate constants.

Answer 1

Question

Chapter 29.7, Problem 12P

Interpretation Introduction

Interpretation:

The pro-R or pro-S hydrogen removed from citrate during the dehydration in step 2 of the citric acid cycle.

Concept introduction:

A molecule is said to be pro chiral, if it can be converted from achiral to chiral a single chemical step.

For instance, an unsymmetrical ketone like 2-butanone is pro chiral because it can be converted to the chiral alcohol 2-butanol, by the addition of hydrogen.

Which enantiomer of 2-butanol is produced depends on which face of the planar carbonyl undergoes reaction to distinguish between the possibilities, the stereo chemical description Re and Si (announced ‘ray’ and ‘sigh’) are used.

The concept of this designation is as follows: Rank the three groups attached to the trigonal, sp² hybridized carbon according to the conventional Cahn-In gold-Prelog (CIP) system and imagine curved among from the highest to second highest, to third highest ranked substituents.

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The reaction for obtaining NO2 from NO and O2 has the rate equation: v = k[NO]2[O2]. Indicate which of the following options is correct.(A). This rate equation is inconsistent with the reaction consisting of a single trimolecular step.(B). Since the overall order is 3, the reaction must necessarily have some trimolecular step in its mechanism.(C). A two-step mechanism: 1) NO + NO ⇄ N2O2 (fast); 2) N2O2 + O2 → NO2 + NO2 (slow).(D). The mechanism must necessarily consist of three unimolecular elementary steps with very similar rate constants.

a. What is the eluent used in the column chromatography here (a “silica plug filtration” is essentially a very short column)? b. The spectroscopy of compound 5b is described in the second half of this excerpt, including 1H-NMR and 13C-NMR (which you will learn about in CHEM 2412L), MS (which you will learn about later in CHEM 2411L) and IR. One of the IR signals is at 3530 cm-1. What functional group does this indicate might be present in compound 5b?

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