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 Multiple Choice QuestionsMultiple Choice Questions

21.

CH3COOH P/Br2 CH2BrCOOH

This reaction is called

  • Schotton-Bauman reaction

  • Finkelstin reaction

  • Hell-Volhard-'Zelinsky reaction

  • none of the above


22.

Arrange the following in the decreasing order of their melting points:
I. Heptane      II. Octane
III. Nonane     IV. Decane

  • IV > II > III > I

  • IV > III > I > II

  • I > II > IV > III

  • II > III > I > IV


23.

The most reactive hydrocarbon is :

  • methane

  • ethane

  • ethylene

  • acetylene


24.

Which of the following is not a cumulated diene?

  • Hexa - 2 , 3 - diene

  • Penta - 1 , 3 - diene

  • Hexa - 1 , 2 - diene

  • Penta - 2 , 3 - diene


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25.

What is the product P ?

  • Both (a) and (b)


26.

In the eclipsed conformation of ethane, the dihedral angle between the hydrogen atoms of adjacent methyl groups is :

  • 60°

  • 120°

  • 180°


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27.

The major product of the addition of water molecule to propyne in the presence of mercuric sulphate and dilute sulphuric acid is :

  • ethanal

  • 2-propanol

  • propane

  • propanone


D.

propanone

In the presence of H2SO4 and HgSO4 as a catalyst, H2O adds to triple bond of propyne to form an unstable enol which readily tautomerises to the propanone. Addition occurs according to Markownikoff 's rule.


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28.

Which of the following statements is not an essential feature of an optically active molecule ?

  • It will rotate the plane of polarised light

  • It will have a non-superimposable mirror image

  • It will have no element of symmetry

  • It will have an asymmetric carbon atom


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29.

The reagent which could distinguish between 1-hexyne and 1-hexene is :

  • Ag(NH3)2+

  • KMnO4

  • Br2 in CCl4

  • H2SO4


30.

Choose the correct reagent required to carry out the transformation :

  • Zn + conc. HCl

  • conc. H2SO4

  • Li then H2O

  • H2/Pt


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