MCQ
Which of the following compounds is most stable?
- A$\text{LiCl}$
- B$\text{LiI}$
- C$\text{LiBr}$
- ✓$\text{LiF}$
✓
Answer
Correct option: D.
$\text{LiF}$
Lithium is an alkali metal and it is electro$-$positive in nature.
The order of electronegativity of halides present in these compounds are as follow:
$\ce{F > Cl > Br > I}$
Hence, lithium fluoride $(\text{LiF})$ is the most stable compound because of the small size of $Li.$
As we go down the group in the periodic table the size of the element increases so, the $\text{Li−X}$ bond becomes weak.
As $Li$ and $F$ are of comparable size that is why $\text{LiF}$ is the most stable.
Also$, \text{LiF}$ has the highest lattice enthalpy.
The order of electronegativity of halides present in these compounds are as follow:
$\ce{F > Cl > Br > I}$
Hence, lithium fluoride $(\text{LiF})$ is the most stable compound because of the small size of $Li.$
As we go down the group in the periodic table the size of the element increases so, the $\text{Li−X}$ bond becomes weak.
As $Li$ and $F$ are of comparable size that is why $\text{LiF}$ is the most stable.
Also$, \text{LiF}$ has the highest lattice enthalpy.
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