The correct statement among the following is:

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1.  **Option 1 (Incorrect):** Reduction of aldehydes ($RCHO$) generally yields **primary alcohols** ($RCH_2OH$), not secondary alcohols. Secondary alcohols are obtained from the reduction of ketones ($RCOR'$). (General organic chemistry principles).
2.  **Option 2 (Incorrect):** Vegetable oils are esters of glycerol (triglycerides). Their hydrolysis (saponification) to give glycerol (glycerin) is typically carried out with **bases** like NaOH, not concentrated $H_2SO_4$ which is a dehydrating agent.
3.  **Option 3 (Correct):** Ethanol ($C_2H_5OH$) contains the methyl carbinol group ($CH_3-CH(OH)-$). When treated with iodine ($I_2$) and alkali ($NaOH$), it undergoes the **Iodoform reaction** to produce a yellow precipitate of Iodoform ($CHI_3$). The reaction is: $C_2H_5OH + 4I_2 + 6NaOH \rightarrow CHI_3 + HCOONa + 5NaI + 5H_2O$. (This reaction is implicitly supported by the text discussing Iodoform tests for methyl ketones and alcohols ).
4.  **Option 4 (Incorrect):** Inversion of sucrose (hydrolysis) into glucose and fructose occurs in the presence of **acid** ($H^+$) or the enzyme invertase, not NaCl .

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