Cannizzaro reaction is not shown by

Identify the reagents $(1-4)$ required for the transformations shown and arrange them in the correct order.
$(1)$ $LiAlH_4$
$(2)$ $OsO_4$
$(3)$ $NaIO_4$
$(4)$ $NaBH_4$

Which of the following will undergo aldol condensation?

When acetaldehyde is heated with Fehling's solution,it gives a red precipitate of:

When ethanal reacts with $CH_3MgBr$ and $C_2H_5OH$/dry $HCl$,the products formed are

Which statement is correct for product '$X$'?
$Cl-CO-CH_2-C(C \equiv CH)(CH_2-CN)-CH_2-CH_2-CO-CH_3 \xrightarrow{H_2/Pd/BaSO_4} X$