1) A mixture containing two enantiomers in equal proportions will have zero optical rotation is known Racemic modification.
2) The process of conversion of enantiomer into a racemic mixture is known as racemisation
3) Cyanide ion act as ambident nucleophile but nitrite ion cannot act as ambident nucleophile.
4) Propene with HBr gives 1-bromopropane in the absence of peroxide.
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