Find out number of reagents which can oxidise 
(i) I2/NaOH
(ii) KMnO4/H⊕
(iii) Tollen's reagent
(iv) LiAlH4
(v) NaBH4
(vii) SeO2/Δ
(viii) NH2 – NH2 / pH (4–6)
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The compound is an aldehyde. Oxidizing agents convert aldehydes to carboxylic acids. Reagents (i) I₂/NaOH (Haloform reaction oxidizes methyl ketones, not aldehydes), (ii) KMnO₄/H⁺ (oxidizes aldehydes), (iii) Tollen's reagent (oxidizes aldehydes), (iv) LiAlH₄ (reducing agent), (v) NaBH₄ (reducing agent), (vi) SeO₂/Δ (oxidizes methylene groups, not aldehydes), (vii) NH₂–NH₂/pH 4-6 (reducing agent). Only (ii) and (iii) are oxidizing agents that work on aldehydes.
Final Answer: 2