Question

which of the following pairs are isosters?
a) CO2 and N2O
b) CaO and KF
c) OF2 and HClO
d) all of these​

Answer 1

Answer:

All the given pairs are isosteres because all the pairs have the same number of atoms and the same number of electrons.

Therefore, option d) all of these is correct.

Explanation:

Isosteres:

• Isosteres are those atoms or compounds that have the same number of atoms and the same number of electrons.

Case 1 $CO_{2}$ and $N_{2}O$

• The number of atoms in $CO_{2}$ = $3$
• The number of atoms in $N_{2}O$ = $3$

Now,

• The number of electrons in $CO_{2}$ =  1 × number of electrons in C-atom + 2 × number of electrons in O-atom.
• The number of electrons in $CO_{2}$ = $(1\times 6) + (2\times 8)$ = $22$ electrons.

And,

• The number of electrons in $N_{2}O$ = 2 × number of electrons in N-atom + 1 × number of electrons in O-atom.
• The number of electrons in $N_{2}O$ = $(2\times 7) + (1\times 8)$ = $22$ electrons.

Therefore, $CO_{2}$ and $N_{2}O$ are isosteres.

Case 2) $CaO$ and $KF$

• The number of atoms in $CaO$ = $2$
• The number of atoms in $KF$ = $2$

Now,

• The number of electrons in $CaO$ = 1 × number of electrons in Ca-atom + 1 × number of electrons in O-atom.
• The number of electrons in $CaO$ = $(1\times 20) + (1\times 8)$ = $28$ electrons.

And,

• The number of electrons in $KF$ = 1 × number of electrons in K-atom + 1 × number of electrons in F-atom.
• The number of electrons in $KF$ = $(1\times19 ) + (1\times 9)$ = $28$ electrons.

Therefore, $CaO$ and $KF$ are isosteres.

Case 3) $OF_{2}$ and $HClO$

• The number of atoms in $OF_{2}$ = $3$
• The number of atoms in $HClO$ = $3$

Now,

• The number of electrons in $OF_{2}$ =  1 × number of electrons in O-atom + 2 × number of electrons in F-atom.
• The number of electrons in $OF_{2}$ = $(1\times8 ) + (2\times 9)$ = $26$ electrons.

And,

• The number of electrons in $HClO$ = 1 × number of electrons in H-atom + 1 × number of electrons in Cl-atom + 1 × number of electrons in O-atom.
• The number of electrons in $HClO$ = $(1\times1 ) + (1\times 17)+ (1\times 8)$ = $26$ electrons.

Therefore, $OF_{2}$ and $HClO$ are isosteres.

Hence, all the pairs are isosteres.

Answer 2

Answer:

d

Explanation:

all the pairs have same number of atoms and