Organic chemistry

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Question 30

Easy

A student is investigating the homologous series of carboxylic acids. The student finds the following information:

Name	Number of carbon atoms	Boiling point ( $∘C^\circ\text{C}$ )
Methanoic acid	1	101
Ethanoic acid	2	118
Propanoic acid	3	141
Pentanoic acid	5	186
Hexanoic acid	6	205

Plot a graph of the boiling points of the carboxylic acids on the grid. Draw a line of best fit.

$A grid for plotting carboxylic acid boiling points. The horizontal axis is labeled 'Number of carbon atoms' and ranges from 0 to 6, with grid lines every 0.1 units. The vertical axis is labeled 'Boiling point (^\circ\text{C})' and ranges from 80 to 220, with numbered grid lines every 20 units (80, 100, 120, 140, 160, 180, 200, 220) and subdivisions of 2 units per small grid square.$

[2]

The student could not find a value for the boiling point of butanoic acid, $C_3H_7COOH$ .

Use the graph to estimate the boiling point of butanoic acid.

Answer = $……………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots$ $∘C^\circ\text{C}$

[1]

Draw the displayed formula of propanoic acid, $C_2H_5COOH$ .

[1]

The carboxylic acids all react in a similar way because they all contain the same functional group.

What is the functional group in a carboxylic acid molecule?

[1]

Ethanoic acid, $CH_3COOH$ , can be prepared by the oxidation of ethanol.

What is the formula of ethanol?

[1]

Organic chemistry

Question 30

Organic chemistry Questions

Organic chemistry

Question 30

Organic chemistry Questions