The reaction $C_6H_5CHO + CH_3CHO \to C_6H_5CH=CHCHO + H_2O$ is known as:

Acetaldehyde, when heated in the presence of sodium hydroxide and $I_2$, forms:

Pyrolysis of acetone gives $CH_2=C=O$ called

Acetone on treatment with $CH_3MgI$ and on further hydrolysis gives:

Arrange these compounds in decreasing order of reactivity for the nucleophilic addition reaction :
$I.$ Acid chloride $II.$ Aldehyde
$III.$ Ketone $IV.$ Ester
Select the correct answer from the codes given below :

In the reaction of benzaldehyde with acetaldehyde in the presence of dilute $NaOH$,the product $(A)$ will be: