Identify correct statements from the followingA) Acetone is the functional isomer of propanalB) Benzene and Toulene are homologuesC) n-propyl alcohol is a chain isomer or isopropyl alcoholD) Diethyl ether and isopropyl methyl ether are metamers

(1) CH3-CO-CH3  and   CH3CH2CHO  .   .    . functional isomers(2) C6H6   and   C6H5CH3    .   .    .   .homologues (differ by -CH2- gp)(3)  CH3-CH2-CH2OH   and  CH3-CHOH-CH3   .   .   .  positional isomers(4) C2H5-O-C2H5   and    CH3-O-CH(CH3)2    .   .   . metamers.