3 This question is about compounds of Group 5 elements. (a) Phosphorus forms two chlorides with the formulae PCl, and PCI,. (i) Explain the shape of the PCl, molecule. The

bond angle is not required. (ii) Draw a diagram to show the three-dimensional shape of the PCI, molecule in the gas phase. Include bond angles and the name of the shape. (iii) Explain why phosphorus forms PCI, but nitrogen does not form NCl;...... (b) Nitrogen trichloride, NCI, , has a boiling temperature of 344 K, and nitrogen trifluoride, NF3, has a boiling temperature of 144K. Explain this difference in boiling temperatures, by referring to all the intermolecular forces present. (c) Which of these compounds produces hydrogen chloride when it reacts with PCl,? O A propanal O B propan-1-ol OC propanone E D propyl propanoate