Which of the following paris of compound may be regarded both as functional isomer and position isomer ?

Which of the following pairs of compounds may be regarded both as position isomers and functional isomers?

Functional isomers are

Which of the following is an isomer of compound 1 ?

Which of the following pairs of compounds are not isomers?

Which of the following pairs of compounds are chain isomers?

Which of the following pairs of compounds are not isomers:-

Which if the following paris of compound is a ring chein isomer ?

Which of the following pairs of compounds are position isomers?