Which of the following statements is INCORRECT?

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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. Calcium carbide will react with water 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.

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 /