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POST MID-TERM EXAMINATION 2022, SUBJECT- CHEMISTRY (043), CLASS- XI a, Max Marks: 35, Time : 2 hr, General instructions , e All question are compulsory, e The question paper consists 12 question divided into four section AB& C, e Section A: Question 1 to 3 are very short answer type questions carrying 2 mark each., ¢ Section B: Question 4 to 11 are short answer type questions carrying 3 marks each., © Section C: Question 12 is competency / case base question carrying 5 marks., , Section - A [Very short answer Type Questions], 1. A) Which out of sodium or potassium has higher melting point?, B) Why alkali metals impart colour to the flame., , 2. A) Why is alkali metal not found in nature?, B) What is the oxidation state of sodium in Na202, , 3. A) Which element of group 13 forms the most stable + 1 oxidation State?, B) What is inert pair effect?, , Section -B [Short Answer Type Question], 4, A) What is water gas? How is it prepared?, B) Suggest a reason as to why CO is poisonous., C) Following oxides as neutral, acidic, basic or amphoteric :- CO ,B203, Si02 ,CO2, Al,033 , PbO2 ,T1203, , , , uw, , 1) What are the common physical and chemical properties of alkali metals?, Il) Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone ?, Or, State as to why :, 1) Asolution of Na2COs3 is alkaline ?, If) Sodium metal is dropped in water 2, , , , 6. Write IUPAC name of the products obtained by the ozonolysis of the following compounds:, B) I) pent-2-ene I) 34 = Dimethylhept-3-ene. II!) 2-Ethylbut-1-ene TV)/i- Phenylbut-1-ene, , 7. 1) cis hept-3-ene. and trans structure of hex -2-ene ., , 11) Which isomer cis and transwill have higher b.p. and why ?, , Or, a II) The chemical preparation of alkenes : !) From alkynes I) From Alkyl halides, % % 8. Would you convert the following compounds into benzene?, 1) Ethyne I})Hexane Ill) Ethene, Or, , Explain the term aromaticity? How can Huckel rule be used to determine the aromaticity of acompound?, , 9. For the following compounds, write structural formula and IUPAC named for all Possible isomer having the, , number of double or triple bond as indicated :, A) C4Hg (one double bond ). B) CsHe (triple bond), , 10. What is Markovinkov's rule & anti markovinkov’s explain with mechanisms ?, , 11. Draw the Sawhorse and Newman projections for the staggered and eclipses confirmations of Ethane.