(C) Chain isomerism requires a minimum of $4$ carbon atoms for alkanes $(C_4H_{10})$,but for alkynes $(C_nH_{2n-2})$,a minimum of $5$ carbon atoms is

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(C) Chain isomerism requires a minimum of $4$ carbon atoms for alkanes $(C_4H_{10})$,but for alkynes $(C_nH_{2n-2})$,a minimum of $5$ carbon atoms is required to show chain isomerism. $C_4H_6$ corresponds to an alkyne $(C_4H_{2(4)-2} = C_4H_6)$,which cannot form a branched chain isomer with only $4$ carbon atoms.