The product of the given reaction is:

Which of the following reactants,on reaction with concentrated $NaOH$ followed by acidification,gives the following lactone as the product?

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

Which reaction intermediate is formed during the condensation reaction between acetaldehyde and formaldehyde?

$CH_3COOCH_3 +$ excess $PhMgBr$ $\rightarrow \text{product}$ $\xrightarrow{H^+} X$. The product $X$ is:

$Ph-CH(OH)-CH_3$ $\xrightarrow{PCC} A$ $\xrightarrow[(ii) H^{+}/\Delta]{(i) NH_2OH} B + C$
In the given reaction sequence,$B$ and $C$ are: