Chemistry MCQs

Page No. 36

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


aOn hydrogenation 208 KJ/mole is liberated

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bC-H bond length in benzene is 1.09 A?

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cMolecular mass of benzene is 78.108

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dResonance energy of benzene is 150.5 K Cal/mole

✓



Which compound will readily undergo sulphonation ?


aBenzene

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bNitro benzene

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cToluene

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dChlorobenzene

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View Answer Toluene

During sulphonation of benzene H2SO4 generates the electrophile _________________?


aH2SO4

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bSO2

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cSO3

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dH+

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View Answer SO3

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


aThe rupturing of benzene ring

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bSubstitution reaction

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cAddition reaction

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dNo reaction

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View Answer Addition reaction

Which one of the following methods will not give benzene ?


aHeating sod. Salt of Benzoic acid with soda lime

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bDistilling phenol with Zn dust

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cChlorobenzene with NaOH at 360°C & 150atm.

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dHydrolysis of benzene sulphonic acid with super heated steam

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


aCr2O3 + A2O3 + SiO2

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bRaney nickel

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cOrgano-nickel

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dNi 250 – 300°C

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View Answer Organo-nickel

The resonance energy of benzene is__________________?


a150.5 kJ/mol

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b250.5 kJ/mol

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c150.5 Cal/mol

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d250.5 Cal/mol

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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

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bThree

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cFour

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dSix

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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

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bThe presence of Hydrogen

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cThe absence of Oxygen

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dThe presence of excessive Oxygen

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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

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bChlorine

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cFluorine

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dIodine

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View Answer Iodine

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