Which of the following does not give an Aldol condensation reaction?

An ester $(A)$ with molecular formula $C_9H_{10}O_2$ was treated with excess of $CH_3MgBr$ and the complex so formed was treated with $H_2SO_4$ to give an olefin $(B)$. Ozonolysis of $(B)$ gave a ketone with molecular formula $C_8H_8O$ which shows positive iodoform test. The structure of $(A)$ is

Arrange the following compounds in the increasing order of their reactivity towards the nucleophilic addition of $HCN$:
$1. HCHO$
$2. CH_3COCH_3$
$3. PhCOCH_3$
$4. PhCOPh$

Which one of the following aldehydes will not form an aldol when treated with $dil. \, NaOH$?

Which of the following reagents is suitable for the preparation of the product in the above reaction?

Which product is formed when the compound $C_6H_5CHO$ is treated with concentrated $KOH$ solution?