Amongst the following compounds, the one that wil not respond to

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

The order of equivalent conductances at infinite dilution for LiCl, NaCl and KCl is

  • LiCl > NaCl > KCl

  • KCl > NaCl > LiCl

  • NaCl > KCl > LiCl

  • LiCl > KCl > NaCl


32.

Compound X is tested and the results are shown in the table.
Test Result
Aqueous sodium hydroxide is added, then heated gently. Gas given off which turns damp red litmus paper blue
Dilute hydrochloric acid is added. Effervescence, gas given off which turns lime water milky and acidified K2Cr2O7, paper green.

Which ions are present in compound X?

  • Ammonium ions and sulphite ions

  • Ammonium ions and carbonate ions

  • Sodium ions and carbonate ions

  • Ammonium ions and sulphate ions


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33.

Amongst the following compounds, the one that wil not respond to Cannizzaro reaction upon treatment with alkali as

  • Cl3CCHO

  • Me3CCHO

  • C6H5CHO

  • HCHO


A.

Cl3CCHO

For a carbonyl group to give Cannizaro reaction, it should not have an -hydrogen atom. Among the given compound Me3CCHO, C6H5CHO and HCHO respond to Cannizaro reaction but Cl3CCHO do not due to following reason.

When hydroxyl group attacks the carbonyl group a tetrahedral intermediate forms. This tetrahedral intermediate will revert to a carbonyl compound by expelling the best leaving group. The carbonium is resonance stabilised therefore it is better leaving group than OH. These initial products exchange a proton to give ion of carboxylic acid and trichloromethane (CHCl3).


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34.

Which of the following compounds would not react with Lucas reagent at room temperature?

  • H2C=CHCH2OH

  • C6H5CH2OH

  • CH3CH2CH2OH

  • (CH3)3COH


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35.

Amongst the following compounds, the one which would not respond to iodoform test is

  • CH3CH(OH)CH2CH3

  • ICH2COCH2CH3

  • CH3COOH

  • CH3CHO


36.

Which of the following will be dehydrated most readily in alkaline medium?


37.

The correct order of basicity of the following compounds is

  • 1<2<3<4

  • 1<2<4<3

  • 2<1<3<4

  • 4<3<2<1


38.

Which of the following reaction will not result in the formation of carbon - carbon bonds?

  • Cannizzaro reaction

  • Wurtz reaction

  • Reimer-Tiemann reaction

  • Friedel-Crafts acylation


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39.

The correct structure of the drug paracetamol is


40.

Amongst the following compounds, the one(s) which readily react with ethanolic KCN.

  • Ethyl chloride

  • Chlorobenzene

  • Benzaldehyde

  • Salicylic acid


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