OBJECTIVE TEST: Mechanism of Organic Reactions.

Mechanism of Organic Reactions                                                 

            Time: 30 min.                                                                                                  M.Marks:30           

           

Two marks for every correct answer and there is one negative mark for each wrong answer.

1-   (CH₃)₃CH₂⁺ dkcksZfu;e vk;u fdl izdkj Lo;a dks vf/kd LFkk;h djrk gS &

    (A)H ‾ shift                                  (B)CH₃‾ shift    

        (C)H ⁺ shift                  (D)CH₃⁺ shift

2-   fuEu esa ls dkSu lokZf/kd vEyh; (most acidic) gS&

    (A) Para nitro benzoic acid           (B)Ortho nitro benzoic acid      

        (C)Acetic acid               (D)Benzoic acid

3-   ukfHkdLusgh ;ksxkRed vfHkfØ;k(Nucleophilic addition reaction) ds fy;s dkcksZfuy lewg dh fØ;k’khyrk(order of reactivity of carbonyl group) dk Øe gS

    (A)H₂C=O > RCHO > ArCHO > R₂C=O > Ar₂C=O

        (B)ArCHO > Ar₂C=O > RCHO > R₂C=O > H₂C=O  

        (C)Ar₂C=O > R₂C=O > ArCHO > RCHO > H₂C=O  

(D)H₂C=O > R₂C=O > Ar₂C=O > RCHO > ArCHO

4-   fdlds fy;s _Pka-value lcls de gksxk\

    (A)CH₃-CCl₂-COOH                   (B) CH₂Cl-CH₂-COOH           

        (C) CH₂Cl-CHCl-COOH             (D) CHCl₂-CH₂-COOH

5-   fuEu esa ls dkSu ,d ukfHkdLusgh (Nucleophile) gS\

    (A)Benzene                                  (B)Hg⁺⁺            

        (C)AlCl₃                      (D)R⁺

6-   dkSu most stable hydrate dk fuekZ.k djsxk\

    (A)CH₃COCH₃                                                      (B)CCl₃CHO

        (C)CH₃CHO                                (D)C₆H₅CHO

7-   Dyksjks csathu dk C−Cl ca/k] esfFky DyksjkbM ds C−Cl ca/k ds lkis{k(Comparatively) gksrk gS &

    (A)Longer and weaker                 (B)Shorter and weaker

        (C)Longer and stronger                (D)Shorter and stronger

8-   dkSu stronger nucleophile gS &

    (A)OH ‾                                       (B)CH₃‾

        (C)Cl‾                                           (D)C₂H₅O‾

8-   Allylic carbonium ion is less stable than -

    (A)Ethyl carbonium ion                (B)Vinyl carbonium ion

        (C)Benzyl carbonium ion             (D)All of these.

9-   vfHkfØ;k (CH₃)₃C−Br + H₂O → (CH₃)₃−OH fdl izdkj dh vfHk0 gS &

    (A)SN¹                                         (B)SN²

        (C)E²                                            (D)E¹

10-  fuEu esa ls dkSu ,fYdy gSykbM dsoy ,d in esa vfHkfØ;k(one step reaction) nsrk gS&

    (A)Primary                                   (B) Secondary

        (C)Tertiary                                    (D)All

11- fuEu esa ls dkSu YkqbZl vEy gS &

     ¼v½ PCl₅         ¼c½     AlCl₃       ¼l½  NCl₃           ¼n½  AsCl₃

12-  fuEu ;kSfxdksa esa fdlesa ukbVªkstu Most basic in nature gS &

    (A)CH₃─NH₂                              (B)CH₃─CH═NH

        (C)CH₃─C≡N                             (D)All are equally basic

13-  fuEu esa ls dkSu lokZf/kd vklkuh ls SN¹ mechanism }kjk fØ;k djsxk\

    (A)(C₆H₅)₃C─Cl                          (B)C₆H₅CH₂Cl

        (C)Cl─CH₂─CH═CH₂                (D)CH₃─CH═CH─Cl

14-  SN¹ mechanism ds laca/k esa dkSu wrong statement gS\

    (A)It is a unimolecular reaction

        (B)It proceeds with complete inversion configuration

        (C)It involves rearrangement

        (D)Tertiary alkyl halides generally give this reaction.

15-  most stable species is -

    (A)R ─C≡C‾                                (B)R₂─C═C‾─R

        (C)R₃C─CH₂‾                              (D)All are equally stable

16-  fuEu esa ls dkSu eqDr ewyd (Free Radical) dk fuekZ.k ugha djrk gS&

    (A)TEL                                         (B)Hydrogen bromide

        (C)Trichloromethane                    (D)Hexaphenyl ethane

17-  fdl izdkj dh vfHk0 ds fy;s Rate µ [substrate][attacking reagent]⁰ gksrk gSA

    (A)SN¹                                         (B)SN²

        (C)Both                                        (D) None

18-  fuEu esa ls dkSu dkcZu ijek.kq vR;Ur 'kh?kzrk ls izfrLFkkiu vfHkfØ;k (Substitution reaction) nsrk gS & 

    (A) sp hybridized                         (B) sp² hybridized

        (C) sp³ hybridized                        (D) All are equally active

19-  Markownikoff’s rule dks fuEu esa ls fdlds }kjk explain ugha fd;k tk ldrk gS&

    (A)Inductive effect                       (B)Hyperconjugation

        (C)Heterolysis                              (D)Mesomeric effect

20-  carbonium ions fdl izdkj ds foyk;dksa (Solvents) esa vf/kd LFkk;h gksrs gS\

    (A)Polar solvents                         (B)Non polar solvents

        (C)Organic solvents                     (D)no effect of solvents

21-  Polar covalent compounds ls Paramagnetic species dh mRifRr fdlesa gksrh gS

    (A)Organic solvents                     (B)Polar solvents

        (C)Liq. NH₃                                 (D)None

22-  Most stable carbonium ion gS &

    (A)C₆H₅─CH₂⁺                                                      (B)para CH₃─[C₆H₄]─CH₂⁺

        (C)para Cl─[C₆H₄]─CH₂⁺           (D)para O₂N─[C₆H₄]─CH₂⁺

23-  CH3-CN esa C-C ca/k dh yackà esa deh D;ksa vkrh gS \

    (A) Conjugation                        (B)Steric effect

        (C)Mesomeric effect                     (D)Hyperconjugation

24-  fuEu esa ls dkSu ,fYdy gSykbM SN¹ fØ;kfof/k }kjk vfHk0 djsxk \

     (A)3-Chloropentane                  (B)2-Methyl-2-Chloro pentane

        (C) Neopentyl Chloride                (D)2-Chloro Pentane

25-  eqDr ewyd dh mifLFkfr esa fdldh laHkkouk ugha gksrh gS &

    (A)Chain reaction                         (B)Homolysis

        (C) conjugation                            (D)Elimination reaction

26-  HCN dk dkcksZfuy lewg ls tqM+uk ,d mnkgj.k gS&

    (A)Electrophilic addition              (B)Nucleophilic addition

        (C)Free radical addition                (D)Nucleophilic substitution

27-  SN¹ mechanism ds fy;s favorable condition gS &

    (A)Polar solvent                           (B)3º-Haloalkanes

        (C)1º-Haloalkanes                        (D)Non polar solvent

28-  fdl vEy dh fØ;k’khyrk lcls de gksxh &

    (A) CH₂(NO₂)CH₂-COOH                (B)CH₃CH(F)-COOH

        (C) CH₂(Br)CH₂-COOH              (D) CH₂(Cl)CH₂-COOH

29-  CH₃&CH₂&OH esa dkSu ca/k lcls vklkuh ls gsVsjksfyfVd fo[k.Mu nsxk &

    (A)C─C                                       (B)C─O

        (C)O─H                                       (D)C─H

30-  Allyl chloride ds C─Cl Bond dh Bond length fuEu esa ls fdlls vf/kd gS&

    (A)Chloroethane                           (B)Benzyl chloride

        (C)Carbon tetra chloride               (D) च्लोरोबेंज़ेने

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