Haloalkanes and Haloarenes PDF

Haloalkanes and Haloarenes TG: @Chalnaayaaar Haloalkanes and Haloarenes 1. Which is not arylic halide ? 4. Which is/are 2° halide...

Haloalkanes and Haloarenes TG: @Chalnaayaaar Haloalkanes and Haloarenes 1. Which is not arylic halide ? 4. Which is/are 2° halide (a) (b) CH2=CH–Cl (1) (c) (d) (2) (e) Correct option is (3) (1) a, c, and d (2) a, c, d and e (3) b and d (4) a and d (4) All 2. Which is true statement ? 5. (1) (1) (2) (2) (3) CH2–X is Benzylic Halide (3) (4) All (4) 3. Which is 4-Bromo-3-Methylpent-2-ene ? 6. (1) (1) (2) (2) (3) (3) (4) (4) TG: @Chalnaayaaar  Digital www.allendigital.in  NEET : NCR [Chemistry] TG: @Chalnaayaaar 7. Which of the following is not correct method to obtain halide 11. (1) Major product is (2) (1) (3) (2) (4) 8. Sulphuric acid is not used during the reaction (3) of alcohol with KI because ? Θ (1) I is strong reducing agent which reduce H2SO4 and converts in I2. Θ (2) I is strong reducing agent which reduce H2SO4 and converts in H-I. (4) (3) Alcohol gets dehydrated. (4) Oxidation of alcohol is possible. 9. Incorrect statement about the following 12. reaction ? Major product is ? (CH3)2CH–CH2–CH3 + Br2 ⎯⎯ hv → (1) Major product is (1) (2) (2) Total structural monobromo derivative obtained are 4 (3) Reaction is free radical substitution (3) (4) (4) None 10. Which reaction gives aryl halide as a major product ? 13. (1) (1) (2) (2) (3) (4) 14. Which reaction does not give cyanide (3) (1) CH3–CH2–Cl + KCN ⎯→ (2) Ph–CH2–OH + NaCN ⎯→ (3) Ph–CH2–Cl + AgCN ⎯→ (4) (4) Both (2) and (3) TG: @Chalnaayaaar www.allendigital.in  Digital Haloalkanes and Haloarenes TG: @Chalnaayaaar 15. Reaction of Haloalkane with AgCN gives 19. Which is the example of racemization isocyanide as the major product not cyanide process? due to - (1) Ph–CH2–Cl + H2O ⎯→ (1) C–N bond is more stable than C–C bond (2) (2) AgCN is mainly covalent and carbon is free to donate electron pair (3) CH3–CH2–CH=CH2 + HCl ⎯→ (3) AgCN is mainly ionic and carbon is free to (4) CH3–CH–D + OH ⎯→ donate electron pair (4) AgCN is mainly covalent bond and Cl nitrogen is free to donate electron pair 20. 16. Most reactive towards SN2 is (1) (2) (1) (2) (3) (4) (3) (4) 21. Which can give only one alkene when heated 17. Incorrect statement about following reaction with KOH ? is (1) 2-Bromopentane (2) 2-Bromo-2-methyl propane Ph—CH—Ph + H2O KOH Ph—CH—Ph (3) 2-Bromo-3-methyl butane Cl OH (4) Neopentyl bromide (1) It occurs in two steps 22. Correct statement regarding Grignard (2) Reaction is Biomolecule substitution reagent (3) Rate of reaction depends on (1) Carbon – magnesium bond is highly polar concentration of only one reactant that is covalent bond halide. (2) Carbon – magnesium bond is ionic bond (4) Reaction intermediate is carbocation. (3) It reacts with Na in aq. medium to give 18. Which is an example of pure inversion alkane as a major product. (4) It reacts with ethyl chloride to give ethene (1) as a major product. 23. Aryl halide is less reactive than aliphatic halide towards NSR due to - (1) The electron pairs on halogen are in (2) conjugation with  bond of ring. (2) Electron rich nucleophile does not attack easily on electron rich arenes. (3) (3) The sp2C of ring holds the electron pair of C–X bond more tightly. (4) All (4) All TG: @Chalnaayaaar  Digital www.allendigital.in  NEET : NCR [Chemistry] TG: @Chalnaayaaar 27. Assertion : Cl is deactivating group but if Haloarene is nitrated then major product 24. is para nitro haloarene not meta. Incorrect statement about above reaction is Reason : Reactivity is controlled by the (1) Reaction is nucleophilic substitution. stronger inductive effect of halogen (–I > +M) and directly influence is controlled (2) Presence of electron withdrawing group by resonance effect. increases reactivity of haloarenes. (1) Both Assertion and Reason are true and (3) The effect is pronounced when –NO2 is the Reason is correct explanation of the introduced at meta position. Assertion. (4) Intermediate anion is formed (2) Both Assertion and Reason are true and 25. Statement-I : In nucleophilic substitution of but Reason is not correct explanation of haloarenes –NO2 at ortho and para increases the Assertion. stability of intermediate anion, compared to (3) Assertion is true but Reason is false. –NO2 at meta position. (4) Both Assertion and Reason are false. 28. False statement about freons is/are ? Statement-II : –M of –NO2 is observed at (1) Chlorofluoro carbon compounds of ortho and para position not at meta position. methane and ethane are freons (1) Both Statement I and Statement II are (2) These are extremely stable, non toxic, true. non corrosive. (2) Both Statement I and Statement II are (3) These are used in aerosol propellants and false. refrigeration. (3) Statement I is true but Statement II is (4) In troposphere, freon is able to initiate false. radical chain reaction that can upset the natural ozone balance. (4) Statement I is false but Statement II is 29. Statement-I : CCl4 can cause the depletion of true. ozone layer. 26. Assertion : Haloarenes gives NSR at high Statement-II : Exposure to CCl4 can make the temperature but 2,4,6 trinitro haloarene heart beat irregular or stop. gives NSR at low warm. (1) Both Statement I and Statement II are true. (2) Both Statement I and Statement II are false. Reason : A nucleophile can attack easily (3) Statement I is true but Statement II is false. when–M group is attached to ring. (4) Statement I is false but Statement II is true. (1) Both Assertion and Reason are true and 30. Incorrect statement is/are is the Reason is a correct explanation of the (1) Grignard reagent should be prepared Assertion. under anhydrous conditions (2) Both Assertion and Reason are true and (2) n Butyl bromide reacted with KCN gives but Reason is not a correct explanation of sec. butyl cyanide (3) Out of C6H5–CHCl–C6H5 and C6H5–CH2–Cl, the Assertion. C6H5–CHCl–C6H5 is easily hydrolysed. (3) Assertion is true but Reason is false. (4) Alkyl halides are polar but immisible with (4) Both Assertion and Reason are false. water. TG: @Chalnaayaaar www.allendigital.in  Digital Haloalkanes and Haloarenes TG: @Chalnaayaaar ANSWER KEY Question 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Answer 3 4 4 1 4 3 3 1 4 4 3 3 4 3 4 Question 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Answer 3 2 3 2 2 2 1 4 3 1 1 1 4 1 2 TG: @Chalnaayaaar  Digital www.allendigital.in