Multiple Choice QuestionsThe order of decreasing reactivity towards an electrophilic reagent, for the following:
i) Benzene
ii) Toluene
iii) Chlorobenzene
iv) Phenol
would be:
(i) > (ii) > (iii) > (iv)
(ii) > (iv) > (i) > (iii)
(iv) > (iii) > (ii) >(i)
(iv) > (iii) > (ii) >(i)
D.
(iv) > (iii) > (ii) >(i)
Benzene having any activating group i.e, OH, R etc., undergoes electrophilic substitution very easily as compared to benzene itself. Thus toluene (C6H5CH3), phenol (C6H5OH) undergo electrophilic substitution very readily than benzene.Chlorine with +E and +M effect deactivating the ring due to strong -I effect. So, it is difficult to carry out the substitution in chlorobenzene than in benzene, so correct order is
Phenol > Toluene > Benzene > Chlorobenzene
The major organic product in the reaction,
CH3 -O- CH(CH3)2 + HI → Product is:
CH3OH + (CH3)2 + CHI
ICH2OCH(CH3)2
CH3O CI(CH3)2
CH3O CI(CH3)2
Which one is the correct order of acidity?
CH2= CH2> CH3– CH = CH2> CH3– C ≡ CH > CH ≡ CH
CH ≡ CH > CH3– C ≡ CH > CH2= CH2> CH3– CH3
CH ≡ CH > CH2= CH2> CH3– C ≡ CH >CH3– CH3
CH ≡ CH > CH2= CH2> CH3– C ≡ CH >CH3– CH3
The heating of phenyl-methyl ethers with HI produces.
Ethyl chlorides
Iodobenzene
Phenol
Phenol
The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order
C2H5OH, C2H6, C2H5Cl
C2H5OH, C2H5Cl, C2H5ONa
C2H5OH, C2H5ONa, C2H5Cl
C2H5Cl, C2H6, C2H5OH
In the reaction,
The electrophile involved is
Dichloromethyl cation (C+HCl2)
Formyl cation (C+HO)
Dichlorocarbene (:CCl2)
Dichloromethyl anion (C-HCl2)
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