The reagent with which both acetaldehyde and acetone react is

An alkene $(A)$ $C_{16}H_{16}$ on ozonolysis gives only one product $(B)$ $C_8H_8O$. $(B)$ can also be obtained by the hydrolysis of the product obtained from the reaction between cyanobenzene and $CH_3MgBr$. $(A)$ shows geometrical isomerism and decolourises $Br_2$ water. $(B)$ on treatment with $SeO_2$ produces $(C)$. Which statement is not correct about $(C)$?

$Ph-C(=O)-CH_3 \xrightarrow{NaOCl} A + \text{salt}$
$A + CH_3-C(=O)-CH_3 \rightarrow B$
$B$ is

Which of the following compounds will give a positive iodoform test?

Which of the following compounds does not give the iodoform test?

Benzaldehyde on reaction with acetophenone in the presence of sodium hydroxide solution gives