Hydrocarbons having the general formula CnH2n– 2 are called ______________.

alkynes
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Isomerism is possible only with hydrocarbons having _______ or more carbon atoms.


four
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The next higher homologue of ethyne is ___________.

propyne 
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The organic compounds having the same molecular formula but different structures are known as __________.

isomers
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The IUPAC name of isobutane is _____________.

2-methyl propane
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