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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Radical addition

answer is D.

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Detailed Solution

When 1,2-dibromoethane is boiled with alcoholic KOH, ethyne (A)is formed.

When Acetylene gas is passed through red hot metallic tube 873K undergoes cyclic polymerization to form Benzene(B)

The product formed when acetylene is passed through red hot tube is

Benzene undergo electrophilic substitution reactions Due to delocalisation of Pi electrons.

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