16. Hydroxy compounds
A section of Chemistry, 9701
Listing 10 of 190 questions
Crotyl alcohol, CH3CH=CHCH2OH, is a colourless liquid which is used as a solvent. In the boxes below, write the structural formula of the organic compound formed when crotyl alcohol is reacted separately with each reagent under suitable conditions. If you think no reaction occurs, write 'NO REACTION' in the box. A Br2 in an inert organic solvent B PCl 5 C H2 and Ni catalyst D NaBH4 E K2Cr2O7 / H+ heat under refl ux Draw the displayed formula of the organic compound formed when crotyl alcohol is reacted with cold, dilute acidifi ed potassium manganate(. Draw the skeletal formula of the compound formed in reaction E. Crotyl alcohol is obtained from crotonaldehyde, CH3CH=CHCHO. Describe one test that would confi rm the presence of a small amount of unreacted crotonaldehyde in the crotyl alcohol. Give the name of the reagent used and state what you would see. reagent observation What type of reaction is the conversion of crotonaldehyde into crotyl alcohol? Compound P, another unsaturated compound, is found in some blue cheeses. The percentage composition by mass of compound P is C: 73.7%; H: 12.3%; O: 14.0%. Calculate the empirical formula of compound P.
9701_s13_qp_22
THEORY
2013
Paper 2, Variant 2
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Compounds containing the allyl group, CH2=CHCH2–, have pungent smells and are found in onions and garlic. Allyl alcohol, CH2=CHCH2OH, is a colourless liquid which is soluble in water. Allyl alcohol behaves as a primary alcohol and as an alkene. Give the structural formula of the organic compound formed when allyl alcohol is reacted separately with each of the following reagents. acidifi ed potassium dichromate(, heating under refl ux bromine in an inert organic solvent cold, dilute, acidifi ed potassium manganate(hot, concentrated, acidifi ed potassium manganate( Allyl alcohol undergoes the following reactions. When reacted with concentrated HCl at 100 °C, CH2=CHCH2Cl is formed. State as fully as you can what type of reaction this is. When reacted with MnO2 at room temperature, CH2=CHCHO is formed. What type of reaction is this? Allyl alcohol can be converted into propanal in two steps. step I step II CH2=CHCH2OH CH3CH2CH2OH CH3CH2CHO What reagents and conditions would be used for each step? step I reagentconditionstep II reagentconditionAllyl alcohol and propanal are isomers. What form of isomerism do they display? Allyl alcohol may also be converted into propanal by using a ruthenium(catalyst in water. ruthenium(catalyst CH2=CHCH2OH CH3CH2CHO Suggest what is unusual about this single step reaction.
9701_s13_qp_23
THEORY
2013
Paper 2, Variant 3
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Questions Discovered
190