Which of the following has the maximum acidic strength ? from Ch

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Oxidation number Fe in K3 [FeCN)6] is

  • +1

  • +2

  • +3

  • +4


22.

The oxide that gives H2O2 on treatment with dilute acid is

  • PbO2

  • MnO2

  • Na2O2

  • TiO2


23.

CH3CHCl2, on hydrolysis, will give

  • CH3CHO

  • CH3COOH

  • CHCl3

  • CH3CH2OH


24.

What is obtained, when potassium succinate soluton is electrolysed ?

  • Ethane

  • Ethene

  • Ethyne

  • All of these


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25.

Which of the following has the maximum acidic strength ?

  • p-nitrophenol

  • p-nitrobenzoic acid

  • o-nitrobenzoic acid

  • m-nitrobenzoic acid


C.

o-nitrobenzoic acid

o-nitrobenzoic acid is the strongest acid among these. NO2 group is a powerful electron withdrawing group and it has most effect when present at o-position. It is also known as o-effect. Due to its electron withdrawing nature electron density on H-atom in -COOH group becomes very less, hence it can be easily donated.


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26.

Lunar caustic is

  • AgCl

  • AgNO3

  • NaOH

  • KNO3


27.

CH3COOH P/Br2 CH2BrCOOH

This reaction is called

  • Schotton-Bauman reaction

  • Finkelstin reaction

  • Hell-Volhard-'Zelinsky reaction

  • none of the above


28.

What is 'X' in the following sequence ?

ArN2Cl KCNCuCN Z H.OH Y soda-lime X

  • Benzoic acid

  • Sodium benzoate

  • Benzaldehyde

  • Benzene


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29.

Bauxite is an ore of

  • boron

  • barium

  • aluminium

  • bismuth


30.

Which of the following turns potassium dichromate paper green?

  • NO2

  • HCl

  • NH3

  • SO2


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