Question

what happened when etanal is heated with I2 and naoh​

Answer 1

Ethanol forms acetaldehyde on oxidation, so it gives the iodoform test. The formation of a pale yellow precipitate when iodine in sodium hydroxide reacts with alcohol that can be oxidized to acetaldehyde is the iodoform reaction. The acetaldehyde is then treated with I2 and NaOH it gives sodium formate and iodoform...

Answer 2

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ᴇᴛʜᴀɴᴏʟ ꜰᴏʀᴍꜱ ᴀᴄᴇᴛᴀʟᴅᴇʜʏᴅᴇ ᴏɴ ᴏxɪᴅᴀᴛɪᴏɴ, ꜱᴏ ɪᴛ ɢɪᴠᴇꜱ ᴛʜᴇ ɪᴏᴅᴏꜰᴏʀᴍ ᴛᴇꜱᴛ. ᴛʜᴇ ꜰᴏʀᴍᴀᴛɪᴏɴ ᴏꜰ ᴀ ᴘᴀʟᴇ ʏᴇʟʟᴏᴡ ᴘʀᴇᴄɪᴘɪᴛᴀᴛᴇ ᴡʜᴇɴ ɪᴏᴅɪɴᴇ ɪɴ ꜱᴏᴅɪᴜᴍ ʜʏᴅʀᴏxɪᴅᴇ ʀᴇᴀᴄᴛꜱ ᴡɪᴛʜ ᴀʟᴄᴏʜᴏʟ ᴛʜᴀᴛ ᴄᴀɴ ʙᴇ ᴏxɪᴅɪᴢᴇᴅ ᴛᴏ ᴀᴄᴇᴛᴀʟᴅᴇʜʏᴅᴇ ɪꜱ ᴛʜᴇ ɪᴏᴅᴏꜰᴏʀᴍ ʀᴇᴀᴄᴛɪᴏɴ. ᴛʜᴇ ᴀᴄᴇᴛᴀʟᴅᴇʜʏᴅᴇ ɪꜱ ᴛʜᴇɴ ᴛʀᴇᴀᴛᴇᴅ ᴡɪᴛʜ ɪ2 ᴀɴᴅ ɴᴀᴏʜ ɪᴛ ɢɪᴠᴇꜱ ꜱᴏᴅɪᴜᴍ ꜰᴏʀᴍᴀᴛᴇ ᴀɴᴅ ɪᴏᴅᴏꜰᴏʀᴍ.