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Which of the following substances involve in addition as well as substitution reactions

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Ethane

Acetylene

Ethylene

Methane

answer is D.

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Detailed Solution

Acetylene undergoes substitution reactions because the acetylide anion is a powerful nucleophile it may displace halide ions from 1º-alkyl halides to give a more highly substituted alkyne as a product (S_N2 reaction).

Ethylene (Alkene) does not prefer electrophilic substitution reactions due to unstability of intermediate species.

In this intermediate, sp² carbon is changed to an sp³ carbon with a negative charge, which is less stable.

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