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 functional isomer and position isomer?

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

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 not isomers:-

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

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