a) Interpretation: Whether the electrocyclic reaction shown takes place in conrotatory or disrotatory manner is to be stated. The conditions, thermal or photochemical, under which the reaction can be carried out also is to be stated. Concept introduction: In elecrocyclic reactions involving even number of electron pairs, a thermal reaction occurs in conrotatory manner and a photochemical reaction occurs in disrotatory manner. In elecrocyclic reactions involving odd number of electron pairs, a thermal reaction occurs in disrotatory manner and a photochemical reaction occurs in conrotatory manner.

Question

* How many milliliters of 97.5(±0.5) wt% H2SO4 with a density of 1.84(±0.01) g/mL will you need to prepare 2.000 L of 0.110 M H2SO4? * If the uncertainty in delivering H2SO4 is ±0.01 mL, calculate the absolute uncertainty in the molarity (0.110 M). Assume there is negligible uncertainty in the formula mass of NaOH and in the final volume (2.000 L) and assume random error.

Answer 1

Question

Chapter 30.SE, Problem 18AP

Interpretation Introduction

a)

Interpretation:

Whether the electrocyclic reaction shown takes place in conrotatory or disrotatory manner is to be stated. The conditions, thermal or photochemical, under which the reaction can be carried out also is to be stated.

Concept introduction:

In elecrocyclic reactions involving even number of electron pairs, a thermal reaction occurs in conrotatory manner and a photochemical reaction occurs in disrotatory manner.

In elecrocyclic reactions involving odd number of electron pairs, a thermal reaction occurs in disrotatory manner and a photochemical reaction occurs in conrotatory manner.

Interpretation Introduction

b)

Interpretation:

Whether the electrocyclic reaction shown takes place in conrotatory or disrotatory manner is to be stated. The conditions, thermal or photochemical, under which the reaction can be carried out also is to be stated.

Concept introduction:

In elecrocyclic reactions involving even number of electron pairs, a thermal reaction occurs in conrotatory manner and a photochemical reaction occurs in disrotatory manner.

In elecrocyclic reactions involving odd number of electron pairs, a thermal reaction occurs in disrotatory manner and a photochemical reaction occurs in conrotatory manner.

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