Q.
$CH _{3} CHO \quad 4 HCHO \quad Ca ( OH )_{2}$
$C ( CHOH )_{4}+\frac{1}{2}( HCOO )_{2} Ca$
the above reaction is an example of
JIPMERJIPMER 2018
Solution:
First three HCHO molecules react with acetaldehyde via crossed aldol condensation, while the fourth HCHO molecule reacts via crossed Cannizzaro reaction.

