Which of the following lithium compounds are less soluble in water than the corresponding sodium compounds?

A $LiBr$
B $Li X_{2} CO X_{3}$
C $LiF$
D $LiCl$

Answer: B, C

LiF and Li2CO3 involve small anions whose lattice enthalpy with Li+ is very large, so they are sparingly soluble. With the larger Cl- and Br- the high hydration enthalpy of Li+ prevails and LiCl and LiBr are more soluble than NaCl and NaBr.

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