1.

Out of the following four compounds, which is expected to show optical activity. {:(""R''),("|"),(R-overset(..)(N)-HR-overset(..)(N)-R'", "R-overset(..)(N)-R' R-N-R),("||||"),(""H""H""R''""R''),("(I)(II)(III)(IV)"):}

Answer»

Only III
Only IV
Both (III) and (IV)
None of these.

Solution :Quaternary ammonium salts with FOUR different groups ATTACHED to nitrogen atom show optical activity. This is because the UNSHARED PAIR of electrons no nitrogen gets bonded and as a result the salt exist as two ENANTIOMERIC forms


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