The structural formula for 1,3-dichlorobenzene has to be drawn. Concept introduction: A benzene ring has six carbon atoms which are sp 2 hybridized and one hydrogen atom attached to each carbon atom thus total six hydrogens are present in benzene ring. Benzene is known as an aromatic compound as it obeys Huckel’s aromaticity rules. The structure of the benzene derivative when one or more hydrogen atoms are replaced by other groups, can be drawn as follows, The systematic name for the benzene derivatives is written by taking the parent name benzene and all the substituent come in the prefix.

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Answer 1

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Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 23, Problem 31PS

(a)

Interpretation Introduction

Interpretation: The structural formula for 1,3-dichlorobenzene has to be drawn.

Concept introduction:

A benzene ring has six carbon atoms which are sp2 hybridized and one hydrogen atom attached to each carbon atom thus total six hydrogens are present in benzene ring. Benzene is known as an aromatic compound as it obeys Huckel’s aromaticity rules.

The structure of the benzene derivative when one or more hydrogen atoms are replaced by other groups, can be drawn as follows,

The systematic name for the benzene derivatives is written by taking the parent name benzene and all the substituent come in the prefix.

(b)

Interpretation Introduction

Interpretation: The structural formula for 1-bromo-4-methylbenzene has to be drawn.

Concept introduction: A benzene ring has six carbon atoms which are sp2 hybridized and one hydrogen atom attached to each carbon atom thus total six hydrogens are present in benzene ring. Benzene is known as an aromatic compound as it obeys Huckel’s aromaticity rules.

The structure of the benzene derivative when one or more hydrogen atoms are replaced by other groups, can be drawn as follows,

The systematic name for the benzene derivatives is written by taking the parent name benzene and all the substituent come in the prefix.

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On the next page is an LC separation of the parabens found in baby wash. Parabens are suspected in a link to breast cancer therefore an accurate way to quantitate them is desired. a. In the chromatogram, estimate k' for ethyl paraben. Clearly indicate what values you used for all the terms in your calculation. b. Is this a "good" value for a capacity factor? Explain. c. What is the resolution between n-Propyl paraben and n-Butyl paraben? Again, indicate clearly what values you used in your calculation. MAU | Methyl paraben 40 20 0 -2 Ethyl paraben n-Propyl paraben n-Butyl paraben App ID 22925 6 8 min

d. In Figure 4, each stationary phase shows some negative correlation between plate count and retention factor. In other words, as k' increases, N decreases. Explain this relationship between k' and N. Plate Count (N) 4000 3500 2500 2000 1500 1000 Figure 4. Column efficiency (N) vs retention factor (k') for 22 nonionizable solutes on FMS (red), PGC (black), and COZ (green). 3000 Eluent compositions (acetonitrile/water, A/W) were adjusted to obtain k' less than 15, which was achieved for most solutes as follows: FMS (30/70 A/W), PGC (60/40), COZ (80/20). Slightly different compositions were used for the most highly retained solutes. All columns were 50 mm × 4.6 mm id and packed with 5 um particles, except for COZ, which was packed with 3 um particles. All other chromatographic conditions were constant: column length 5 cm, column j.§. 4.6 mm, flow rate 2 mL/min, column temperature 40 °C, and injection volume 0.5 μL Log(k'x/K'ethylbenzene) FMS 1.5 1.0 0.5 0.0 ཐྭ ཋ ཤྩ བྷྲ ; 500 0 5 10…

f. Predict how the van Deemter curve in Figure 7 would change if the temperature were raised from 40 °C to 55 °C. Figure 7. van Desmter curves in reduced coordinates for four nitroalkane homologues (nitropropane, black; nitrobutane, red; nitropentane, blue; and nitrohexane, green) separated on the FMS phase. Chromatographic conditions: column dimensions 50 mm × 4.6 mm id, eluent 30/70 ACN/water, flow rates 0.2-5.0 mL/min, injection volume 0.5 and column temperature 40 °C. No corrections to the plate heights have been made to account for extracolumn dispersion. Reduced Plate Height (h) ° 20 40 60 Reduced Velocity (v) 8. (2) A water sample is analyzed for traces of benzene using headspace analysis. The sample and standard are spiked with a fixed amount of toluene as an internal standard. The following data are obtained: Ppb benzene Peak area benzene Peak area toluene 10.0 252 376 Sample 533 368 What is the concentration of benzene in the sample?

Answer 2

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Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 23, Problem 31PS

(a)

Interpretation Introduction

Interpretation: The structural formula for 1,3-dichlorobenzene has to be drawn.

Concept introduction:

A benzene ring has six carbon atoms which are sp2 hybridized and one hydrogen atom attached to each carbon atom thus total six hydrogens are present in benzene ring. Benzene is known as an aromatic compound as it obeys Huckel’s aromaticity rules.

The structure of the benzene derivative when one or more hydrogen atoms are replaced by other groups, can be drawn as follows,

The systematic name for the benzene derivatives is written by taking the parent name benzene and all the substituent come in the prefix.

(b)

Interpretation Introduction

Interpretation: The structural formula for 1-bromo-4-methylbenzene has to be drawn.

Concept introduction: A benzene ring has six carbon atoms which are sp2 hybridized and one hydrogen atom attached to each carbon atom thus total six hydrogens are present in benzene ring. Benzene is known as an aromatic compound as it obeys Huckel’s aromaticity rules.

The structure of the benzene derivative when one or more hydrogen atoms are replaced by other groups, can be drawn as follows,

The systematic name for the benzene derivatives is written by taking the parent name benzene and all the substituent come in the prefix.

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Answer 3

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Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 23, Problem 31PS

(a)

Interpretation Introduction

Interpretation: The structural formula for 1,3-dichlorobenzene has to be drawn.

Concept introduction:

A benzene ring has six carbon atoms which are sp2 hybridized and one hydrogen atom attached to each carbon atom thus total six hydrogens are present in benzene ring. Benzene is known as an aromatic compound as it obeys Huckel’s aromaticity rules.

The structure of the benzene derivative when one or more hydrogen atoms are replaced by other groups, can be drawn as follows,

The systematic name for the benzene derivatives is written by taking the parent name benzene and all the substituent come in the prefix.

(b)

Interpretation Introduction

Interpretation: The structural formula for 1-bromo-4-methylbenzene has to be drawn.

Concept introduction: A benzene ring has six carbon atoms which are sp2 hybridized and one hydrogen atom attached to each carbon atom thus total six hydrogens are present in benzene ring. Benzene is known as an aromatic compound as it obeys Huckel’s aromaticity rules.

The structure of the benzene derivative when one or more hydrogen atoms are replaced by other groups, can be drawn as follows,

The systematic name for the benzene derivatives is written by taking the parent name benzene and all the substituent come in the prefix.

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 4

Question

Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 23, Problem 31PS

(a)

Interpretation Introduction