Q. 25

Identify the pair

Answer :

I and II,

III and IV,


V and VI


Explanation:


Position isomerism means, where the length of the parent chain and functional group is same but the position of the functional group is different, then it is called position isomer. In case of( I and II ) the parent chain has 4 Carbons each. But the functional group –OH is on 1st carbon in the 1st compound and on 2nd carbon in the 2nd compound.In (V and VI) alsothe parent chain has 4 Carbons each. But the functional group –O- (ether) is placed between 2nd and 3rd carbon in compound V while the ether group is placed between 1st and 2ndcarbon in compound VI. In case of (III and IV) the parent chain has only 3 carbons(as it is branched), but the –OH group in compound III is on 1st carbon while –OH group in compound IV is on 2nd carbon. since they have the same chain length and same functional group but different positions for functional group.


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