Halo Alkenes and Alkynes PDF

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AIMS ACADEMY, HOSUR.

1. The most reactive nucleophile among the following is (a) CH3 O– (b) C6 H5 O– (c) (CH3 )2 CHO– (d) (CH3 )3 CO–

2. CH3 CH2 CHCl CH3 obtained by chlorination of n-butane, will be (a) meso-form (b) racemic mixture (c) d-form (d) 1-form 3. In Friedel-Crafts synthesis of toluene, reactants in addition to anhydrous AlCl 3 are: (a) C6 H6 + CH4 (b) C6 H6 + CH3 Cl (c) C5 H5 Cl + CH3 Cl (d) C6 H5/sub>Cl + CH4 4. SN1 reaction of alkyl halides leads to (a) retention of configuration (b) racemisation (c) inversion of configuration (d) none of these. 5. Nucleophilieity order is correctly represented by

6. Which of the following are arranged in the decreasing order of dipole moment? (a) CH3 Cl, CH3 Br, CH2 F (b) CH3 Cl, CH3 F, CH3 Br (c) CH3 Br, CH3 Cl, CH3 F (d) CH3 Br, CH3 F, CH3 Cl

7. Which of the following is a free radical substitution reaction?

(d) CH3 CHO + HCN → CH3 CH (OH) CN

8. The reactivity order of halides for dehydrogenation is (a) RF > RCl > RBr > RI (b) RI > RBr > RCl > RF (c) RI > RCl > RBr > RF (d) RF > RI > RBr > RCl 9. The addition of HBr is easiest with (a) CH2 = CHCl (b) ClCH = CHCl (c) CH3 -CH = CH2 (d) (CH3 )2 C = CH2 10. Among the following compounds, the decreasing order of reactivity towards electrophilic substitution is

(a) III > I > II > IV (b) IV > I > II > III (c) I > II > III > IV (d) II > I > III > IV 11. Unpleasant smelling carbylamines are formed by heating alkali and chloroform with (a) Any aliphatic amine (b) Any aromatic amine (c) Any amine (d) Any primary amine

12. Which among MeX, R-CH2 X, R2 CHX, R3 CX is most reactive towards S N2 reaction (a) MeX (b) RCH2 X (c) R3 CHX (d) R3 CX 13. Number of stereoisomers of the compound 2-chloro-4- methylhex-2-ene is /are (a) 1 (b) 2 (c) 4 (d) 16

14. In chlorination of benzene, the reactive species is (a) Cl+ (b) Cl– (c) Cl2 (d) Cl−2

15. An organic compound, on treatment with Br2 in CCl 4 gives bromo derivative of an alkene. The compound will be (a) CH4 -CH = CH2 (b) CH3 -CH = CH- CH3 (c) HC = CH (d) H2 C = CH2

16. If one H is replaced by a Cl atom in C 4 H9 Cl, the total number of structural isomers will be (a) 4 (b) 5 (c) 7 (d) 10

17.Anti-Markovnikov addition of HBr is not observed in (a) Propene (b) 1-Butene (c) But-2-ene (d) Pent-2-ene

18. Among the following, the molecule with the highest dipole moment is (a) CH3 Cl (b) CH2 Cl2 (c) CHCl3 (d) CCl4

19. The number of isomers for the compound with molecular formula C 2 Br Cl FI is (a) 3 (b) 4 (c) 5 (d) 6 20. (CH3 )3 C MgBr on reaction with D2 O produces (a) (CH3 )3 CD (b) (CH3 )3 COD (c) (CH3 )3 CD (d) (CD3 )3 OD 21. A solution (+) -2-chloro-2-phenylethane in toluene racemises slowly in the presence of small amount of SbCl5 , due to the formation of (a) Carbanion (b) Carbene (c) Free radical (d) Carbocation 22. In the addition of HBr to propene in the absence of peroxides, the fist step involves the addition of (a) H+ (b) Br – (c) H° (d) Br° 23. In the reaction of p-Chlorotoluene with KNH2 in liq. NHy the major product is (a) o-toluidine (b) m-toluidine (c) p-toluidine (d) p-chloro aniline 24. During debromination of meso-dibromo butane, the major compound formed is (a) n-butane (b) 1-butene (c) cis-2-butene (d) trans-2-butene. 25. The number of possible enantiomeric pairs that can be produced during monochlorination of 2-methyl butane is (a) 2 (b) 3 (c) 4 (d) 1 26. Arrange the following compounds in order of increasing dipole moment: Toluene (I), mdichlorobenzene (II), o- dichlorobenzene (III) and p-dichlorobenzene (IV). (a) I < IV < II < III (b) IV < r < II < III (c) IV < I < III < II (d) IV < II < I < III

27. In the following groups : – O Ac (I), – O Me (II), – O SO2 Me (III), – OSO2 CF3 (IV), The order of leaving group ability is (a) I > II > III > IV (b) IV > III > I > II (c) m > II > I > IV (d) II > III > IV > I 28. Identify the set of reagent/reaction conditions X and Y in the following set of transformations:

(a) X = dil. aqueous NaOH, 20° C, Y = HBr/Acetic acid, 20°C (b) X = Cone, alcoholic NaOH, 80°C, Y = HBr/acetic acid, 20°C (c) X = dil. aqueous NaOH, 20°C Y – Br2 /CHCl3 ,0°C (d) X = Cone, alcoholic NaOH, 80°C, Y = Br 2 /CHCl3 , 0°C. 29. In the presence of peroxide, hydrogen chloride and hydrogen iodide do not give antiMarkovnikov’s addition to alkenes because (a) both are highly ionic (b) one is oxidizing and the other is reducing (c) one of the steps is endothermic in both the cases (d) all the steps are exothermic in both the reactions 30. When chlorine is passed through propene at 400°C, which of the following is formed? (a) FVC (b) Allyl Chloride (c) Vinyl Chloride (d) 1,2-Dichloroethane 31) Arrange the following compounds in order of increasing dipole moment: (I) Toluene (II) m-dichlorobenzene (III) o-dichlorobenzene (IV) p-dichlorobenzene A) I...