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Chloroform easily gets converted to pois...

Chloroform easily gets converted to poisonous phosgene in the presence of air and sunlight. Which of the following substances is added to prevent the formation of phosgene?

A

Ethanol

B

Sodium carbonate

C

Diethyl carbonate

D

Sodium hydroxide

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The correct Answer is:
A
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The boiling point elevation and freezing point depression of solutions have a number of partical applications. Ethylene glycol (CH_(2)OH-CH_(2)OH) is used in automobile radiatiors as an antifreeze because it lowers the freezing point of the coolant. The same substance also helps to prevent the radiator coolant from boiling away by elevating the boiling point. Ethylene glycol has low vapour pressure. We can also use glycerol as an antifreeze. In order for the boiling point elevation to occur, the solute must be non-volatile, but no such restriction applies to freezing point depression. For example, methanol (CH_(3)OH) , a fairly volatile liquid that boils only at 65^(@)C , is sometimes used as an antifreeze in automobile radiators. Which among the following is the most volatile and the best antifreeze?

The pollution which come directly in the air from sources are called primary pollutants . Primary pollutants are sometimes converted into secondary pollutants. Which of the following belong to secondary air pollution ?

When ethanol reacts with ethanoic acid in the presence of conc. H_(2)SO_(4) , a substance with fruity smell is produced. Answer the following: (i) State the class of compounds to which the fruity smelling compounds belong. Write the chemical equation for the reaction and write the chemical name of the product formed. Sate the role of conc. H_(2)SO_(4) .

MODERN PUBLICATION-HALOALKANES AND HALOARENES -MCQ (LEVEL-II)
  1. Which of the following is a gem dihalide?

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  2. The correct order of melting and boiling points of primary (1^(@)), se...

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  3. Chloroform easily gets converted to poisonous phosgene in the presence...

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  4. Chlorination of toluene in the presence of sunlight gives :

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  5. The most suitable reagents required to prepare iodobutane from 1-buten...

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  6. The product of the reaction

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  7. Ethylidene chloride and ethylene chloride are isomeric compounds. Whic...

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  8. The the reaction CH(3)CHOoverset(PCl(5))rarrXoverset(aq.KOH)rarrY,Y ...

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  9. Aryl halides are less reactive than alkyl halides towards nucleophilic...

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  10. Which of the following on reaction with aqueous KOH gives acetaldehyde...

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  11. A mixture of 1-chloropropane and 2-chloropropane when treated with alc...

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  12. Benzyl chloride reacts with chlorobenzene in the presence of dry ether...

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  13. Iodoform gives a precipitate with AgNO(3) on heating but chloroform do...

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  14. S(N)1 mechanism of alkyl halides is favoured by :

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  15. Which of the following on reaction with aqueous KOH will give ethanal?

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  16. Which of the following statements is not correct?

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  17. Which of the following chloro derivatives of benzene would undergo hyd...

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  18. 1-Phenyl-2-chloropropane when treated with alcoholic potash gives main...

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  19. Which of the following is an example of Sandmeyer reaction?

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  20. Which of the following gives precipitate of AgCl readily with alcohlic...

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