The product which is formed by the dehydrogenation of propane should be determined along with its name and structural formula. Concept Introduction: The chemical reaction which involves the removal of hydrogen atom from an organic molecule is known as dehydrogenation. This reaction is a reverse of hydrogenation. In this reaction, alkanes are converted into olefins which are more reactive than alkanes. Rules for naming alkenes or olefins are: First choose the longest continuous chain of carbon atoms having double bond known as parent chain. The numbering of parent chain should be done in a way that the double bond and substituents get the lowest number. The root name of the carbon chain is same as in case of alkanes, but “−ane” ending is replaced by “−ene”. The appropriate name should be given to every alkyl group and denote its position on the parent chain with the number. The alkyl groups are written in alphabetical order.

Question

(a 4 shows scanning electron microscope (SEM) images of extruded actions of packing bed for two capillary columns of different diameters, al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the same stationary phase, spherical particles with 1-um diameter. A) When the columns were prepared, the figure shows that the column with the larger diameter has more packing irregularities. Explain this observation. B) Predict what affect this should have on band broadening and discuss your prediction using the van Deemter terms. C) Does this figure support your explanations in application question 33? Explain why or why not and make any changes in your answers in light of this figure. Figure 4 SEM images of sections of packed columns for a) 750 and b) 30-um-i.d. capillary columns.³

Answer 1

Question

Chapter 20, Problem 3ALQ

Interpretation Introduction

Interpretation:

The product which is formed by the dehydrogenation of propane should be determined along with its name and structural formula.

Concept Introduction:

The chemical reaction which involves the removal of hydrogen atom from an organic molecule is known as dehydrogenation. This reaction is a reverse of hydrogenation. In this reaction, alkanes are converted into olefins which are more reactive than alkanes.

Rules for naming alkenes or olefins are:

First choose the longest continuous chain of carbon atoms having double bond known as parent chain.

The numbering of parent chain should be done in a way that the double bond and substituents get the lowest number.

The root name of the carbon chain is same as in case of alkanes, but “−ane” ending is replaced by “−ene”.

The appropriate name should be given to every alkyl group and denote its position on the parent chain with the number.

The alkyl groups are written in alphabetical order.

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