Identify the compound that exhibits tautomerism:

In the following sequence of reactions,compound $M$ is:
$M$ $\xrightarrow{CH_3MgBr} N + CH_4 \uparrow$ $\xrightarrow{H^+} CH_3COCH_2COCH_3$

The product$(s)$ formed when $m$-chlorobenzaldehyde is heated with concentrated $NaOH$ is/are:

Predict the product in the given reaction:
$3-\text{chlorobenzaldehyde} \xrightarrow{50\% \text{KOH}, \Delta} ?$

Which of the following compounds on reaction with ammoniacal silver nitrate solution forms a precipitate of silver?

Identify $R', R''$ and $R'''$ for the following reaction: $R'R''C=O \xrightarrow{(i) R'''MgX, (ii) H_2O} 2-methylbutane-2-ol$