Doubt from isomerism

In illustration 3.2 why 2 and 4 are not positional isomers

For position isomerism the main chain name should be same but here it is changing so it can’t be positional isomer

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Question 2 i am getting 4 isomers and even in solution they gave only four isomers but mentioning 5 isomers possible that is option d given in answer key

Number of structural isomer will be 4 but total number of isomer i.e sterio + structural will be 5

2nd compound is chiral and hence 2 isomer possible for 2nd structure and rest all only 1
Therefore 5 isomers

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Oh i see answer key had mentioned RS in second structure

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