Friday, 19 August 2016

Chapter 10 Alkyl halides important MCQs

FSC part 2 Chemistry book Alkyl halides 

chapter 10
15.               SN2 reactions can be best carried out with:
(a)    Primary alkyl halides                (b)    Secondary alkyl halides
(c)   Tertiary alkyl halides  (d) All the three 26. Elimination bimolecular reactions involve: 
(a)  1st order kinetics (b)  2nd order kinetics 
(c)  3rd order kinetics (d)  Zero order kinetics
27.               In β – elimination reaction, nucleophile attacks on
(a)    - Hydrogen    (b)  β – Hydrogen       
        (c)  Carbon               (d)  None of these
28.               Which one of the following is most stable
(a)    Primary carbonium ion             (b)  Sec – carbonium ion
        (c)  Ter – carbonium ion                     (d)  None of them
29.               Alkyl magnesium halide when hydrolysed by water yields
(a)    Alkanes         (b)  Alkene                (c)  Alkyne (d)  Alkyl halide
30.               Tertiary alcohols are obtained by treating Grignard reagent with
(a)    Aldehydes       (b)  Ketones              (c)  Water         (d)  Chloramine
31.               An alkyl halide may be converted to alcohol by
(a)    Addition                 (b)  Substitution 
(c)  Dehydrohalogenation (d)  Elimination
32.               Which substance is used to convert Grignard reagent to alkane 
(a)    H2O                (b)  NH3                  (c)  Ethyl alcohol       (d)  All of these
33.               Benzene cannot undergo
(a)    Substitution reactions      (b)  Addition reactions
        (c)  Oxidation reactions              (d)  Elimination reactions
34.               Benzene ring acts as a source of
(a)    Protons           (b) Neutrons     (c)  Electrons    (d)  None of them
35.               Which compound is most reactive one?
(a)    Benzene                 (b)  Ethene               (c)  Ethane        (d)  Ethyne
36.               Aromatic compounds burn with sooty flame because
(a)    They have high % age of hydrogen (b)  They have ring structure
        (c)  They have high % age of carbon           (d)  They resist reaction with air
37.               _____________ alkyl halides follow both SN1 and SN2 mechanisms
(a)    Primary           (b)  Secondary          (c)  Tertiary               (d)  Cyclic
Alkyl halides
38.               The formula for sodium lead alloy is
(a)    NaPb       (b)  NaPb4              (c)  Na2Pb         (d)  Na4Pb
39.               The general formula form alkyl halides is 
(a)    CnH2nX            (b)  CnH2n+1X             (c)  CnHnX         (d)  CnH2n+2X
40.               When CO2 is made to react with C2H5 Mg I followed by acid hydrolysis, the product formed is 
(a) Propane  (b)  Propanoic acid 
        (c)  Proponal             (d)  Peoponol

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