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a
Acetylene is insoluble in conc. H2SO4 due to the formation of vinyl carbocation
b
Ethylene is soluble in conc. H2SO4 due to the formation of alkyl carbocationH3C−CH2⊕HSO4⊖
c
But -2-yne dissolves in conc. H2SO4 due to the formation of vinyl carbocation (Me−C⊕=CH−Me) HSO4⊖, but it is stabilised by electron-donating methyl group and is more stable than the vinyl carbocation formed from acetylene.
d
More the s character in the positively charged C, the more stable is the carbocation and more likely is its formation.
answer is A.
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