5. Study the information in the table below and answer the questions that follow: Ion P3- No. of protons 7 No. of electrons Q+ R2+ 19 12 a) Write the electron arrangement of element P. 10 18 10 b) Give the group and period to which elements Q and R respectively. Q R 6. 7. Compound W reacted with chlorine to form compound X only. The structural formula of X is shown below: CH3 CH-CH-CH3 Cl Cl (a) Give the structural formula and name of compound W (b) Name compound X In petrol chemical industries, long chain alkanes are broken down in to simpler substances in a process called cracking a) Why is cracking necessary? b) State the two conditions required in cracking c) Draw the structure of 1-chloro-2, 2-dimethylpropane 8. In a reaction an alcohol K was converted to hex-1-ene a) Name reagent and condition necessary for the reaction in 6 (a) above to occur