Chemistry MCQs

Page No. 21

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


aE1 – reaction

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bE2 – reaction

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cSN1 – reaction

✓


dSN2 – reaction

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View Answer SN1 – reaction

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


aZn / HCI

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bSOCl2 / Pyridine

✓


cPCI3

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dPCI5

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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

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bthree

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cone

✓


dfour

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View Answer one

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


aformaldehyde

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bacetaldehyde

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cpropanone

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dcarbondioxide

✓


View Answer carbondioxide

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


aprimary alcohol

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bsecondary alcohol

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ctertiary alcohol

✓


ddihydric alcohol

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View Answer tertiary alcohol

Which one of the following species is not an electrophile ?


aNH3

✓


bBr+

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cH+

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dBF3

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View Answer NH3

The ether used in Wurtz synthesis is__________________?


aAcidic

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bBasic

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cAqueous

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ddry

✓


View Answer dry

Grignard reagent is reactive due to___________________?


athe presence of halogen atom

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bthe presence of magnesium atom

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cthe polarity of C-Mg bond

✓


dall

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Elimination bimolecular reactions involve____________________________?


afirst order kinetics

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bsecond order kinetics

✓


cthird order kinetics

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dzero order kinetics

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View Answer second order kinetics

The rate of E1 reaction depends upon______________________?


athe concentration of substrate

✓


bthe concentration of nucleophile

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cthe concentration of substrate as well as nucleophile

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dbase the concentration of substrate as well as nucleophile

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