OCR AS LEVEL CHEMISTRY B PAPER 2 JUNE 2022 QUESTIONS ONLY

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1 Natural rubber is a polymer of 2-methylbuta-1,3-diene. H3C H2C CH2 C C H 2-methylbuta-1,3-diene (a) Draw the skeletal formula of 2-methylbuta-1,3-diene. [1] (b) The... carbon-carbon double bond consists of both a sigma(σ) and a pi(π) bond. (i) The diagram of ethene below shows the position of the sigma(σ) bond between the carbon atoms. On the diagram sketch the shape and position of the pi(π) bond. H H C C H H σ bond [1] (ii) Explain the meaning of the wedge bond ( ) in terms of the 3-D shape of ethene. ........................................................................................................................................... ...................................................................................................................................... [1] (c) 2-chlorobuta-1,3-diene, CH2=CCl CH=CH2 is made in industry. It polymerises, as shown in equation 1.1. H2C n Cl CH2 C C H Equation 1.1 2-chlorobuta-1,3-diene poly(2-chlorobuta-1,3-diene) (i) Polymerisation of buta-1,3-diene, CH2=CHCH=CH2, occurs in the same way to form a synthetic rubber. Draw the structural formula for poly(buta-1,3-diene). [1] [Show More]

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