Predict the product of following aldol condensation reaction:

${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CHO}\stackrel{{\mathrm{OH}}^{-}/\mathrm{\Delta }}{\to }$

Predict the product of following aldol condensation reaction:

$\mathrm{Ph}-{\mathrm{CH}}_2-\mathrm{CHO}\stackrel{{\mathrm{OH}}^{-}/\mathrm{\Delta }}{\to }$

Predict the product of following aldol condensation reaction:

$\mathrm{Ph}-\mathrm{CO}-{\mathrm{CH}}_3\stackrel{{\mathrm{OH}}^{-}/\mathrm{\Delta }}{⟶}$

Indicate the starting aldehyde or ketone from which, the following compound is formed by an aldol condensation reaction:

$2-$Ethyl$-3-$hydroxy hexanal

Indicate the starting aldehyde or ketone from which, the following compound is formed by an aldol condensation reaction:

$4-$Hydroxy$-4-$methyl$-2-$pentanone

Predict the products of following cross condensation reaction:

Predict the products of following cross condensation reaction:

Predict the products of following cross condensation reaction: