Isoelectronic structures among the following structures are :
`(I) CH_3^+ , (II) H_3O^+ (III) NH_3, (IV) CH_3^-`.

Pick out the isoelectronic structures from the following . I CH_3^+ (II) H_3O^+ , (III) NH_3, (IV) CH_3^- :

Pick out the isoelectronic structures from the following (i) CH_(3)^(+) , (ii) H_(3)O^(+) (iii) NH_(3) , (iv) CH_(3)^(-)

Pick out the isoelectronic structures from the following (i) CH_(3)^(+) , (ii) H_(3)O^(+) (iii) NH_(3) , (iv) CH_(3)^(-)

Pick out the isoelectronic structure from the following I. CH_(3)^(+) " " II. H_(3)O^(+) III. NH_(3) " " IV CH_(3)^(-)

Pick out the isoelectronic structures from the following underset (I) CH_3^+ underset (II) (H_3) O^+ underset (III) NH_3 underset (IV) CH_3^- .

Iso-structural species among the following are (l) CH_(3)^(+)(ll)H_(3)O^(+)(lll)NH_(3)(IV)CH_(3)^(-)

Iso-structural species among the folwong are (l) CH_(3)^(+)(ll)H_(3)O^(+)(lll)NH_(3)(IV)CH_(3)^(-)

The decreasing order of acidic character of the following is : (I) CH_3 SH (II) CH_3 OH (III) H_2 O (IV) EtOH .

The decreasing order of acidic character of the following is : (I) CH_3 SH (II) CH_3 OH (III) H_2 O (IV) EtOH .

The decreasing order of the basic character of the following is : (I) F^(Ө) (II) NO_3^(Ө) (III) H_2 O (IV) CH_3 OH .