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Which of the following are correct structural isomers of butane?

(a) (i) and (iii)

(b) (ii) and (iv) 

(c) (i) and (ii)

(d) (iii) and (iv)

Answers (1)


Solution: Structural isomers: two or more organic compounds having the same molecular formulas but different structures.

Butane: C_4H_{10}

Structure (i) is n-butane. It is a structural isomer of butane.

Structure (iii) is iso-butane. It is a structural isomer of butane.

Other structures, i.e., (ii) and (iv) have different molecular formula, hence incorrect

Therefore, option (c) is correct.

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