17.1. Aldehydes and ketones
A subsection of Chemistry, 9701, through 17. Carbonyl compounds
Listing 10 of 304 questions
In the following boxes draw the structural formulae of three alcohols having straight (i.e. unbranched) chains, with the molecular formula C5H12O. A B C Use the letters A, B or C as appropriate when answering the following questions. Each letter may be used once, more than once or not at all. Which of the alcohols are chiral? Which of these alcohols react with alkaline aqueous iodine? Describe the observation you would make during this reaction. Draw the structural formulae of the products of this reaction. Draw the structural formula of the product obtained when each of the alcohols A, B and C is heated with an excess of acidified K2Cr2O7. A B C One of the many suggestions for converting biomass into liquid fuel for motor transport is the pyrolysis (i.e. heating in the absence of air) of cellulose waste, followed by the synthesis of alkanes. In the first reaction, cellulose, (C6H10O5)n, is converted into a mixture of carbon monoxide and hydrogen. Some carbon is also produced. Complete and balance the equation for this reaction. (C6H10O5)n ————————— + ————————— + ————————— The second reaction involves the combination of CO and H2 to produce alkanes such as heptane. 7CO + 15H2 C7H16 + 7H2O heptane Using the value of 1080 kJ mol−1 as the value for the CO bond energy in CO, and other relevant bond energies from the Data Booklet, calculate the ∆H for this reaction. ∆H = kJ mol−1
9701_s09_qp_4
THEORY
2009
Paper 4, Variant 0
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