Chemistry MCQs

Page No. 36

Which one of the following statement is not correct about benzene ?


aOn hydrogenation 208 KJ/mole is liberated


bC-H bond length in benzene is 1.09 A?


cMolecular mass of benzene is 78.108


dResonance energy of benzene is 150.5 K Cal/mole



Which compound will readily undergo sulphonation ?


aBenzene


bNitro benzene


cToluene


dChlorobenzene


View Answer Toluene

During sulphonation of benzene H2SO4 generates the electrophile _________________?


aH2SO4


bSO2


cSO3


dH+


View Answer SO3

Reacting bromine with benzene in the presence of sunlight will result in_______________?


aThe rupturing of benzene ring


bSubstitution reaction


cAddition reaction


dNo reaction


View Answer Addition reaction

Which one of the following methods will not give benzene ?


aHeating sod. Salt of Benzoic acid with soda lime


bDistilling phenol with Zn dust


cChlorobenzene with NaOH at 360°C & 150atm.


dHydrolysis of benzene sulphonic acid with super heated steam



What catalyst is employed when benzene is prepared from acetylene at 70°C?


aCr2O3 + A2O3 + SiO2


bRaney nickel


cOrgano-nickel


dNi 250 – 300°C


View Answer Organo-nickel

The resonance energy of benzene is__________________?


a150.5 kJ/mol


b250.5 kJ/mol


c150.5 Cal/mol


d250.5 Cal/mol


View Answer 150.5 kJ/mol

How many moles of H2 are added up when benzene is heated with hydrogen in the presence of platinum ?


aTwo


bThree


cFour


dSix


View Answer Three

Michael Faraday discovered benzene in the gas which was produced by destructive distillation of vegetable oil that is done in________________?


aThe presence of Oxygen


bThe presence of Hydrogen


cThe absence of Oxygen


dThe presence of excessive Oxygen


View Answer The absence of Oxygen

When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound ?


aBromine


bChlorine


cFluorine


dIodine


View Answer Iodine

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