Find out number of reagents which can oxidise ethanal.
$i) I_{2} / N a O H i i) C r O_{3}$
$i i i) Tollens' reagent i v) L i A I H_{4}$
$v) N a B H_{4} v i) mCPBA$
$v i i) S e O_{2} / Δ v i i i) N H_{2} - N H_{2} / p H (4 - 6)$

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Solution

$i) C H_{3} - C H O I_{2} / N a O H - --------- \to Indoform reaction C H I_{3} + H - O | | C - O^{-}$

$(i i) C H_{3} C H O C r O_{3} - -- \to C H_{2} C O O H$

$(i i i) C H_{3} C H O T o l l e n s^{'} - ---- \to R e a g e n t s C H_{3} C O O H$

$(v i) C H_{3} C H O m C P B A - ---- \to C H_{3} C O O H$

$(v i i) C H_{3} C H O S e O_{2}, Δ - ---- \to H O | | C - O | | C H$

Hence here five reagents can oxidise $C H_{3} C H O$ .

$L i A I H_{4}, N a B H_{4}$ and $N H_{2} - N H_{2} / p H (4 - 6)$ are reducing agent hence it can not oxidise.

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