Q.

n–Butane and isobutane are a pair of

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a

 Chain isomers 

b

Position isomers

c

Metamers

d

 Functional isomers

answer is A.

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Detailed Solution

  • n-butane and iso-butane have the same molecular formula but different carbon chain in main chain. So, they are chain isomers. 
    n-butane: CH3​CH2​CH2​CH3
    iso-butane: CH3​CH(CH3​)CH3
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