uestions","formulaUrl":null,"initialIndex":59,"initialQuestionWindow":[{"id":"81aa5369-30fe-4af8-b715-926ad4e364e5","revisionId":"e37aa5b2-64e7-42d0-92de-d4444e7b2cdb","questionNumber":null,"questionType":"LA","specification":"A student is investigating the homologous series of carboxylic acids. The student finds the following information:\n\n| Name | Number of carbon atoms | Boiling point (\$^\\circ\\text{C}\$) |\n| :--- | :---: | :---: |\n| Methanoic acid | 1 | 101 |\n| Ethanoic acid | 2 | 118 |\n| Propanoic acid | 3 | 141 |\n| Pentanoic acid | 5 | 186 |\n| Hexanoic acid | 6 | 205 |","difficulty":4,"difficultyBand":"easy","totalMarks":6,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"cffd4ee6-833f-4eff-ad61-d20e7867c97d","label":"a","content":"Plot a graph of the boiling points of the carboxylic acids on the grid. Draw a line of best fit.\n\n![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.](https://assets.mathsgenie.co.uk/aqa-qb/5ea8b7cc-bcad-411d-8ca5-917edcaae9e7.png)","markscheme":"- Plots the five points correctly at $(1, 101)$, $(2, 118)$, $(3, 141)$, $(5, 186)$, and $(6, 205)$ to within half a small grid square M1\n- Draws a smooth curve or line of best fit through the plotted points A1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]},{"id":"e51b2b6b-48be-47f3-aacd-e73d6efcab22","label":"b","content":"The student could not find a value for the boiling point of butanoic acid, \$C_3H_7COOH\$.\n\nUse the graph to estimate the boiling point of butanoic acid.\n\nAnswer = \\dots\\dots\\dots\\dots\\dots\\dots\\dots\\dots\\dots\\dots\\dots \$^\\circ\\text{C}\$","markscheme":"- Estimates the boiling point of butanoic acid from the graph in the range $161\\ ^\\circ\\text{C}$ to $167\\ ^\\circ\\text{C}$ B1","marks":1,"order":1,"markingRubric":null,"explanation":null,"options":[]},{"id":"b52f6af4-cc32-4f3b-971e-de6f31e6020c","label":"c","content":"Draw the displayed formula of propanoic acid, \$C_2H_5COOH\$.","markscheme":"- Draws the fully displayed formula of propanoic acid with all atoms and bonds shown:\n $$\\begin{array}{ccccc}\n \\text{H} & \\text{H} & \\text{O} \\\\\n | & | & \\!\\!/\\!/ \\\\\n \\text{H}-\\text{C}-&\\!\\!\\!\\text{C}-&\\!\\!\\!\\text{C}-\\text{O}-\\text{H} \\\\\n | & | & \\\\\n \\text{H} & \\text{H} &\n \\end{array}$$ B1","marks":1,"order":2,"markingRubric":null,"explanation":null,"options":[]},{"id":"dae187c8-76d3-4d28-884e-8a259000e08a","label":"d","content":"The carboxylic acids all react in a similar way because they all contain the same functional group.\n\nWhat is the functional group in a carboxylic acid molecule?","markscheme":"- States the functional group as $-\\text{COOH}$ or carboxyl / carboxylic acid group B1","marks":1,"order":3,"markingRubric":null,"explanation":null,"options":[]},{"id":"b61baf97-4734-4e3d-8b58-82513742658e","label":"e","content":"Ethanoic acid, \$CH_3COOH\$, can be prepared by the oxidation of ethanol.\n\nWhat is the formula of ethanol?","markscheme":"- States the formula of ethanol as $\\text{C}_2\\text{H}_5\\text{OH}$ or $\\text{CH}_3\\text{CH}_2\\text{OH}$ B1","marks":1,"order":4,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"89ca44be-55b1-4f01-af9a-b90ac28287f8","revisionId":"eec2ab08-cdf7-429a-8ceb-a0bf652e6308","questionNumber":null,"questionType":"MC","specification":"What is the formula of the product in this addition reaction?\n\n![Addition reaction of ethene with bromine](https://assets.mathsgenie.co.uk/aqa-qb/7e4292ff-8113-4725-a483-65c4ae018ec9.png)","difficulty":3,"difficultyBand":"easy","totalMarks":1,

Organic chemistry

Question 31

Organic chemistry Questions

Organic chemistry

Question 31

Organic chemistry Questions