TASK 3 ( Mechanism & Predict Structure)
1 | Dehydration of 2-methylcyclohexanol with concentrated sulphuric acid yields a mixture of three alkenes. Draw all the structure of alkenes and suggest the major product . Propose the mechanism of its formation | |||
2 | Two organic compounds, A and B have a similar molecular formula, C4H9Cl. Both compounds react with sodium hydroxide aqueous solution to form C and D with molecular formula C4H10Cl via SN1 and SN2 mechanisms respectively. Draw the structure of A, B, C and D. Write a mechanism for the formation of D. | |||
3 | Chlorination of benzene is different from the chlorination of methane. a) State the type of reaction for chlorination of benzene. b) Write the mechanism. | |||
4 | A few organic compounds represented by the letters P to S are shown below: Which of the above compounds will; a) form an ester when it reacts with ethanol? b) decolorised hot acidified KMnO4? c) form silver mirror when it reacts with Tollen's reagent? | |||
5 | Both P (C2H4O) and Q (C2H6O) react similarly with an alkaline iodine solution. But only P can react with 2,4 DNPH to produce yellow precipitate. a) Identify P & Q. Explain b) Write the chemical equations for the above reactions | |||
6 | When compound S (C4H10O) is reacted with acidified KmnO4, compound T is obtained. Reaction of S with concentrated H2SO4 yields hydrocarbon U (C4H8). Compound U reacts with dilute H2SO4 to produce compound W (C4H10O). Compound W does not react with acidified KMnO4 and its is an isomer of compound S. Determine the structural formula of S, T, U and W. | |||
7 | An ester C4H8O2 produces carboxylic acid A, C3H6O2 and alcohol B, CH4O. Alcohol B reacts with PBr3 to yield alkyl halide C. When treated with KCN followed by hydrolysis (acid), this halides produces carboxylic acid D which contain less one carbon atom than the above acid. Deduce the structures of ester, compound A, B, C & D. Write all chemical equation for the reaction involved. |
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