A) substitution
B) synthesis
C) cracking
D) polymerization
Correct Answer: C
Solution :
Key Idea: (i) In substitution: reaction an atom or group or group of atoms replaces other. (ii) In synthesis: reaction new compound is formed from elements. (iii) Cracking: Involved breaking of alkane molecules 'into smaller hydrocarbon molecules, (iv) Polymerisation is condensation of smaller units to form bigger molecule. \[\therefore \]\[\underset{\text{reaction}}{\mathop{{{C}_{12}}{{H}_{26}}}}\,\xrightarrow{{}}{{C}_{6}}{{H}_{12}}+{{C}_{6}}{{H}_{14}}\]is cracking
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