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Which of the following statements are not correct for alkanes
In alkanes every carbon is $$sp^3$$, with C-H about $$1.112\,\mathring{A}$$, C-C about $$1.54\,\mathring{A}$$ and bond angles close to the tetrahedral $$109^\circ 28'$$, so the carbon chain is zig-zag, not linear. Methane, ethane and propane have no isomers, so not all alkanes show isomerism. Hence statements c and d are not correct.
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