Chemistry MCQs

Page No. 21

50% inversion of configuration of molecules take place in a___________________?


aE1 – reaction


bE2 – reaction


cSN1 – reaction


dSN2 – reaction


View Answer SN1 – reaction

The best method of preparation of alkyl halides is a reaction of alcohol with__________________?


aZn / HCI


bSOCl2 / Pyridine


cPCI3


dPCI5


View Answer SOCl2 / Pyridine

In primary alkyl halides the halogen atom is attached to a carbon which is further attached to how many carbon atoms__________________?


atwo


bthree


cone


dfour


View Answer one

Which one of the following molecules does not form alcohol when reacts with Grignard reagent ?


aformaldehyde


bacetaldehyde


cpropanone


dcarbondioxide


View Answer carbondioxide

Which one of the following alcohols will be formed when ethyl magnesium bromide reacts with acetone ?


aprimary alcohol


bsecondary alcohol


ctertiary alcohol


ddihydric alcohol


View Answer tertiary alcohol

Which one of the following species is not an electrophile ?


aNH3


bBr+


cH+


dBF3


View Answer NH3

The ether used in Wurtz synthesis is__________________?


aAcidic


bBasic


cAqueous


ddry


View Answer dry

Grignard reagent is reactive due to___________________?


athe presence of halogen atom


bthe presence of magnesium atom


cthe polarity of C-Mg bond


dall



Elimination bimolecular reactions involve____________________________?


afirst order kinetics


bsecond order kinetics


cthird order kinetics


dzero order kinetics


View Answer second order kinetics

The rate of E1 reaction depends upon______________________?


athe concentration of substrate


bthe concentration of nucleophile


cthe concentration of substrate as well as nucleophile


dbase the concentration of substrate as well as nucleophile



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