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

The reaction $CH_3CHO \xrightarrow[Zn(Hg) / \text{Conc. } HCl]{[H]} CH_3CH_3$ is:

Identify the major product formed from the following reaction sequence:
$CH_3-CH=CH_2$ $\xrightarrow[(i) HBr]{(ii) NaOH}$ ${\xrightarrow[(iii) Cu/573 \ K]{(iv) Ba(OH)_2, \Delta}} ?$

What is meant by the following terms? Give an example of the reaction in each case.
$(i)$ Cyanohydrin
$(ii)$ Acetal
$(iii)$ Semicarbazone
$(iv)$ Aldol
$(v)$ Hemiacetal
$(vi)$ Oxime
$(vii)$ Ketal
$(viii)$ Imine
$(ix)$ $2,4-DNP$ derivative
$(x)$ Schiff's base

The best reagent to convert $pent-3-en-2-ol$ into $pent-3-yn-2-one$ is

$A$ mixture of benzaldehyde and formaldehyde on heating with aqueous $NaOH$ solution gives: