Question

what is sp2 hybridisation draw with example

Answer 1

First i want to say that hybridisation is a hypothetical concept. many this occurs when to orbitals overlap each other i will explain this whith a nice example
   Let us consider a molecule methene the structure is
       
                                                  H-H-C=C-H-H (acutually the hydrogens both are atached to carbon only due to the computer typing the structure is not clear )
  So, the carbon as one double bond amd only two hydrogens atached to it so its valency is four and the atachaments are four so its having a double bond so it has SP2 hybridisation

Answer 2

☆ ΛПƧЩΣЯ ☆

Iɴ ᴛʜɪs ʜʏʙʀɪᴅɪsᴀᴛɪᴏɴ ᴏɴᴇ 's' ᴀɴᴅ ᴛᴡᴏ 'ᴘ' ᴏʀʙɪᴛᴀʟs ᴜɴᴅᴇʀɢᴏᴇs ʜʏʙʀɪᴅɪsᴀʏɪᴏɴ ᴛᴏ ɢɪᴠᴇ ᴛʜʀᴇᴇ SP2 ᴏʀʙɪᴛᴀʟs ᴛʜᴇsᴇ sʜᴀᴘᴇ ᴏғ ʜʏʙʀɪᴅ ᴏʀʙɪᴛᴀʟs Tʀɪɢᴏɴᴀʟ ᴘʟᴀɴᴀʀ ᴡɪᴛʜ ʙᴏɴᴅ ᴀɴɢʟᴇ 120°.

Tʜᴇ ᴇxɪᴛᴇᴅ ʙᴏʀᴏɴ ᴀᴛᴏᴍ ᴜɴᴅᴇʀɢᴏᴇs SP2 ʜʏʙʀɪᴅɪsᴀᴛɪᴏɴ ᴅᴜʀɪɴɢ ғᴏʀᴍᴀᴛɪᴏɴ ᴏғ BCL3, ᴛʜᴇ SP3 ʜʏʙʀɪᴅ ᴏʀʙɪᴛs ᴏғ ʙᴏʀᴏɴ ᴜɴᴅᴇʀɢᴏᴇs Hᴇᴀᴅ ᴏɴ ᴏᴠᴇʀʟᴀᴘ ᴡɪᴛʜ sʜᴀᴘᴇ ᴏғ Tʀɪɢᴏɴᴀʟ ᴘʟᴀɴᴇ ᴡɪᴛʜ ʙᴏɴᴅ ᴀɴɢʟᴇ 120°.

Example is in right attachment pic.

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