The major product of the addition of water molecule to propyne in

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

271.

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


272.

The most reactive hydrocarbon is :

  • methane

  • ethane

  • ethylene

  • acetylene


273.

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


274.

What is the product P ?

  • Both (a) and (b)


Advertisement
275.

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

  • 60°

  • 120°

  • 180°


Advertisement

276.

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.


Advertisement
277.

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


278.

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

  • Ag(NH3)2+

  • KMnO4

  • Br2 in CCl4

  • H2SO4


Advertisement
279.

Choose the correct reagent required to carry out the transformation :

  • Zn + conc. HCl

  • conc. H2SO4

  • Li then H2O

  • H2/Pt


280.

The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25°C and it increases the temperature of 18.94 kg of water by 0.632°C. If the specific heat of water at 25°C is 0.998 cal/g-deg, the value of the heat of combustion of benzoic acid is

  • 881.1 kcal

  • 771.2 kcal

  • 981.1 kcal

  • 871.2 kcal


Advertisement