Which of the following will give $-ve$ Tollen's but $+ve$ Iodoform test?

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

The major product of which of the following reactions is not obtained by a rearrangement reaction?

Match the following:

Column-$1$ (Reaction of carbonyl compound with)	Column-$2$ (Product)
$A$. Hydroxylamine	$I$. Hydrazone
$B$. Alcohol	$II$. Schiff's base (Substituted imine)
$C$. Hydrazine	$III$. Oxime
$D$. Amine	$IV$. Ketal

The correct match is:

When $m$-chlorobenzaldehyde is treated with $50\%$ $KOH$ solution,the product$(s)$ obtained is (are):

What are $A, B, C$ and $D$ in the following cross-aldol condensation reaction?
$\text{Propanal} + \text{Ethanal} \xrightarrow[ii) \ \Delta]{i) \ NaOH} A + B + C + D$
(The products are the four possible $\alpha,\beta$-unsaturated aldehydes formed by self and cross-aldol condensation followed by dehydration.)