20 CHEMISTRY QUESTIONS WITH ANSWERS 100 LEVEL STUDENTS SHOULD STUDY

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Ans- D. (Alcoholic KOH) Explanation: The reduction of 2-bromo-2-methyl propane to 2-methyl propene is known as dehydrohalogenation reaction (that is removal of hydrogen and halogen). This reaction takes place in the presence of a strong base, and it is used to produce alkenes.

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Ans-Silver nitrate in ammonia solution ( Ag[NH 3 ] 2 2+ ) . This gives a white precipitate with terminal alkynes.

Ammonical solution of copper(1) chloride (cu[NH 3 ] 2 + ). This gives a red precipitate with terminal alkynes.

(cu[NH

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Ans- mass spectrometer is a device that is majorly used to detect the mass of an element. This device displays different peaks with different mass value (this peaks shows the different mass of the atom fragment). [option C]

Ans- (a) effective collision is a collision in which the reacting molecules must be properly oriented and also the reacting molecules must collide with enough energy for bond to break (activation energy).



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1. Which of the following reagents would be most suitable for reducing 2-bromo-2-methyl propane to 2-methyl propene? (a) Zn/CHCOOH (B) NaBH(C) LiAlH(D) Alcoholic KOH.2. The acid obtained from crushed ants is ________________3. ----O----; this functional group represents_________________4. CH-CH=CH+ HCL A, A is _______________5. What is the monomer unit of polyvinyl chloride?6. (CHC=CHCH+ O→F →A + B ; F, A and B are ___________, __________ and ______________. this reaction is taking place in the presence of zinc in dilute acid.7. What is the colour of bromine in CCLwhen 2-butene is added?8. What is the reagent used to convert propyl chloride to propene?9. List four methods used to prepare alkenes.10. CHC CCH+ H(lindlar catalyst) →A.11. Two reagents used in the identification of terminal alkynes are ____________and _____________12. With which reagents does propyne gives a completely different reaction from propene?13. Which reagents will react with an alkene to form a trans diol?_____________14. Which of the following is correct about inductive effect? (a) Increase with bond angle (b) has lower bond energy. (c) Dies away with increase in distance. (d) Is an effect of unsaturated compounds15. Exterification of propane-1,2,3-triol and unsaturated higher carboxylic acid will produce_________ (a) Fat (b) soap (c) methyl-propanoate (d) alkanols (e) oils.16. When starch undergoes complete enzyme-catalyzed hydrolysis, the resulting product is _________ (a) Glucose (b) maltose (c) sucrose (d) fructose (e) cellulose.17. Which of the following is suitable for determining different isotopes present in an element which exhibit isotopy? (a) Geiger Muller counter (b) sensitive weighing balance (c) mass spectrometer (d) cathode ray tube (e) eudiometer.18. (a) Explain what is meant by effective collision? (b) What deduction can be made about a system in which its G is zero?19. Suggest three conditions necessary for maximum yield of AB in the reaction represented by the following equation:2A+ B→2AB ∆H= xkj20. It has been observed that hydrogen peroxide decomposes when expose to air. Which regents can be used to slow down the decomposition? _________