Identify the reaction in which the carbonyl group of aldehydes and ketones is reduced to a methylene group upon treatment with hydrazine followed by heating with sodium hydroxide in ethylene glycol.

  • A
    $A$ Wolff-Kishner reduction
  • B
    $B$ Clemmensen reduction
  • C
    $C$ Stephen reaction
  • D
    $D$ Etard reaction

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The reaction shown below is:

The product in the given reaction is:

Explain the different oxidation reactions of aldehydes and ketones.

The increasing order of the rate of $HCN$ addition to the following compounds is:
$(A)\ HCHO$
$(B)\ CH_3COCH_3$
$(C)\ PhCOCH_3$
$(D)\ PhCOPh$

$CH_3CHO$ $\xrightarrow[5\,^{\circ}C]{10\%\,NaOH}$ $\xrightarrow[\Delta]{}$ $\xrightarrow[Ni]{H_2} (A)$; Product $(A)$ of the reaction is

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