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Which of the following statements is INCORRECT?

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CHEMISTRY

Which of the following statements is INCORRECT?

B. H2C = CH2 will serve as a monomer in the preparation of polythene

C. both but-i-ene and but-i-yne will decolourize bromine readily

D. carbide will react with to form any alkyne

QUICK ANSWER…

D

EXPLANATION…  

Calcium carbide reacts with water to form a specific alkyne called ethyne, not all alkynes.

CaC2 + 2H2O = C2H2 + Ca(OH)2

Now for the right answer to the above question:

  1. Option A is incorrect. the statement in this option is correct, remember, we are to identify the incorrect statement.
  2. Option B is incorrect. Yes, the monomer of polythene is ethene (C2H4).
  3. C is incorrect. Bromine water is used to test for unsaturation, that is double or triple bond. So, bromine water will be decolorized by alkenes and alkynes. this statement too is correct.
  4. D is the correct answer. This is the false statement among the options. Calcium carbide reacts with water to form only ethyne and no other alkynes.
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QUICK TIPS…

You may please note these/this:

  • Other alkynes are synthesized with different varieties of reactants.

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/ culled from 2016 JAMB-UTME Chemistry past question 15 /

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