Treatment of cyclopentanone with methyl lithium gives which of the following species?

How many compounds among the following give white crystals when reacted with sodium bisulphite $(NaHSO_3)$?
$1. HCHO$
$2. CH_3CHO$
$3. CH_3COCH_3$
$4. C_6H_5COCH_3$
$5. C_6H_5COC_6H_5$

Identify the reagent $R$ used in the following reaction:
$\text{Ketone} \xrightarrow{R} \text{Semicarbazone}$

Which of the following compounds will form lactic acid from its cyanohydrin?

Which of the following compounds will not give the iodoform test with alkali and iodine?

$\text{Phthalic anhydride}$ $\xrightarrow {PCl_5} A$ $\xrightarrow {LiAlH_4} B$ $\xrightarrow {PCC} C$ $\xrightarrow [\Delta ] {OH^{-}} D$
Compound $D$ is :-