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CBSE Class 11 Pre Board 2019 : Chemistry (St Xavier's Sr. Sec. School, Delhi)

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Annual Examination in CHEMISTRY Std. 11 16-2-2019 Time : 3 hrs. Max. Marks : 70 General Instructions: i) Question numbers 1 - 5 carry 1 mark each. ii) Question numbers 6 - 12 carry 2 marks each. iii) Question numbers 13 - 24 carry 3 marks each. iv) Question numbers 25 - 27 carry 5 marks each. v) Use log table if necessary. 1. What is common ion effect? (OR) What are Lewis bases? Give an example. (1) 2. Boiling point of alkanes increases down the homologous series. Explain. (1) 3. B3+ ions are not known. Why? (1) 4. Write the IUPAC name of the product obtained by the addition reaction of HBr to Hex-1-ene in the presence of a peroxide. (1) 5. Differentiate between oxidation number and valency. (1) 6. a) b) Butan-2-one and Butanal are isomers. Name the type of isomerism. Why addition reaction of alkenes are electrophilic in nature? (OR) What are Grignard reagents? Give chemical equation for the preparation of propane from a Grignard reagent. (2) 7. a) b) Give an example for homogeneous equilibria. State Le-Chatlier s Principle. (2) 8. a) b) Why does aluminium chloride behave as Lewis acid? What happens when orthoboric acid is heated? (2) 9. a) Write the IUPAC name: i) CH3 - CH - CH2 - CH - CH3 OH ii) CH3 OCH3 b) 10. (OR) Draw the structure of the following: i) 2-Methyl pent-1, 4-diene ii) 3-Chloro 4-ketohexanal (2) Complete the following reactions: a) b) Std. 11 COOH NaNO3 Li +O2 Heat (2) -2- CHEMISTRY

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