NEET Questions Solved


The product of the reaction between 

 +(CH3)3COH ?

(1)             (2)        (3)           (4) 

(1) Grignard reagent with any compound containing acid hydrogen forms a hydrocarbon.

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The reaction of toluene with Cl2 in the presence of FeCl3 gives 'X' and reaction in presence of presence of light gives 'Y'. Thus 'X' and 'Y' are                                            

(a) X= benzal chloride, Y=o-chlorotoluene

(b) X=m-chlorotoluene, Y=p-chlorotoluene

(c) X=o and p-chlorotoluene, Y= trichloromethyl benzene

(d) X= benzyl hloride, Y=m-chlorotoluene

(c) In the presence of halogen carrier, electrophilic substitution occurs, while in the presence of sunlight, substitution occurs at the side chain.

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What products are formed when the following compound is treated with Br2 in the presence of FeBr3?                                                                            

(c) CH3 is an o/p-directing group, thus electrophilic substitution reaction of toluene.

        

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In Friedel-Craft's alkylation, besides AlCl3 the other reactants are                                     

(a) C6H6 + NH2

(b) C6H6 + CH4

(c) C6H6 + CH3Cl

(d) C6H6 + CH3COCl

(c) Friedel-Craft's alkylation When benzene reacts with alkyl halide in presence of anhy. AlCl3, toluene is obtained. It is called Friedel-Craft's alkylation. Friedel-Craft's reaction is type of electrophilic substitution.

  C6H6 + CH3Cl Anhy.AlCl3C6H5CH3 + HCl

                                      Toluene

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Benzene reacts with n-propyl chloride in the presence of anhydrous AlCl3 to give                    

(a) 3-propyl-1-chlorobenzene

(b) n-propyl benzene

(c) no reaction

(d) iso-propyl benzene

(d) Electrophilic substitution reaction of Benzene ring.

 

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In a set of reactions, ethyl benzene yielded a product D.                                 

(d) Alkaline KMnO4 converts complete carbon chain that is directly attached to benzene nucleus, to -COOH group. Br2 in the presence of halogen carrier causes bromination by electrophilic substitution reaction and ethyl alcohol in acidic medium results in esterification.

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In Friedel-Craft's synthesis of toluene, the reactants in addition to anhydrous AlCl3 are           

(a) C6H5Cl + CH4

(b) C6H5Cl + CH3Cl

(c) C6H6 + CH4

(d) C6H6 + CH3Cl

(d) Friedel-Craft's alkylation of benzene (Ar-H) mechanism of this reaction is represented as follows:

Thus C6H6 and CH3Cl are required in addition to AlCl3

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In Friedel-Craft's synthesis of toluene, the reactants in addition to anhydrous AlCl3 are

(a) C6H5Cl + CH4

(b) C6H5Cl + CH3Cl

(c) C6H6 + CH4

(d) C6H6 + CH3Cl

(d) Friedel-Craft's alkylation of benzene (Ar-H) Mechanism of this reaction is represented as follows :

Step I

  CH3Cl + AlCl3C+H3 + AlCl4- 

                           Electrophilie

Step II

 + C+H3Slow 

                                         Intermediate carbocation

Step III

 + AlCl4- Fast + AlCl3 + HCl

Thus, C6H6 and CH3Cl are required in addition to AlCl3.

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In the reaction, C6H5CH3OxidationNaOHBSoda lime

the product C is:

(a) C6H5OH                              (b) C6H6

(c) C6H5COONa                        (d) C6H5ONa

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Xylene on oxidation with acidic KMnO4 gives:

(a) phthalic acid                          (b) isophthalic acid

(c) terephthalic acid                    (d) all of these

(d) O

      o-, m-, p-xylene           Phthalic (o-), isophthalic

                                           (m-) and terephthalic

                                                 (p-) isomers 

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