Chapter 10 Alkyl halides important MCQs

FSC part 2 Chemistry book Alkyl halides 

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)  1^st order kinetics (b)  2^nd order kinetics 

(c)  3^rd 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

38.               The formula for sodium lead alloy is

(a)    N_aPb       (b)  N_aPb₄              (c)  Na₂Pb         (d)  Na₄Pb

39.               The general formula form alkyl halides is 

(a)    C_nH_2nX            (b)  C_nH_2n+1X             (c)  C_nH_nX         (d)  C_nH_2n+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