Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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31.

Which one of the following methods are used to prepare Me3COEt with good yield?

  • Mixing EtONa with Me2CCl

  • Mixing Me2CONa with EtCl

  • Heating a mixture of (1:1) EtOH and Me2COH in the presence of conc. H2SO4

  • Treatment of Me3COH with EtMgI


B.

Mixing Me2CONa with EtCl

Me3CONa (10 alkyl halide)-NaClEtCl Me3COEt

This reaction is known as Williamson's synthesis.


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32.

Upon treatment with I2 and aqueous NaOH, which of the following compounds will form iodoform?

  • CH3CH2CH2CH2CHO

  • CH3CH2COCH2CH3

  • CH3CH2CH2CH2CH2OH

  • CH3CH2CH2CH(OH)CH3


33.

Upon treatment with Al(OEt)3 followed by usual reactions (work up), CH3CHO will produce:

  • only CH3COOCH2CH3

  • a mixture of CH3COOH and EtOH

  • only CH3COOH

  • only EtOH


34.

Which one of the following properties are exhibited by phenol?

  • It is soluble in aq. NaOH and evolves CO2 with aq. NaHCO3

  • It is soluble in aq. NaOH and does not evolve CO2 withe aq. NaHCO3

  • It is not soluble in aq. NaOH but evolves CO2 with aq. NaHCO3

  • It is insoluble in aq. NaOH and does not evolve CO2 with aq. NaHCO3


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35.

The basicity of aniline is weaker in comparison to that of methylamine due to:

  • hyper conjugative effect of Me-group in MeNH2

  • resonance effect of the phenyl group in aniline

  • the lower molecular weight of methylamine as compared to that of aniline

  • resonance effect of -NH2 group in MeNH2


36.

Under identical conditions, the SN1 reaction will occur most efficiently with:

  • tert-butyl chloride

  • 1-chlorobutane

  • 2-methyl-1-chloropropane

  • 2-chlorobutane


37.

Identify the method by which Me3CCO2H can be prepared:

  • Treating 1 mole of MeCOMe with 2 moles of MeMgl

  • Treating 1 mole of MeCO3Me with 3 moles of MeMgI

  • Treating 1 mole of MeCHO with 3 moles of MeMgl

  • Treating 1 mole of dry ice with 1 mol of MeCMgI


38.

The most contributing tautomeric enol form of MeCOCH2CO2 Et is:

  • CH2=C(OH)CH2CO2Et

  • MeC(OH)=CHCO2Et

  • MeCOCH=C(OH)OEt

  • CH2=C(OH)CH=C(OH)OEt


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39.

By passing excess Cl2(g) in boiling toluene, which one of the following compounds is exclusively formed?


40.

An equimolar mixture of toluene and chlorobenzene is treated with a mixture of conc. H2SO4 and conc. HNO3. Indicate the correct statement from the following.

  • p-nitrotoluene is formed in excess

  • equimolar amounts of p-nitrotoluene and p-nitro chlorobenzene are formed

  • p-nitro chlorobenzene is formed in excess

  • m-nitro chlorobenzene is formed in excess


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