Alright — let's do this. The question asks for an organic compound that does not react with both hydrogen cyanide (HCN) and hydroxylamine ($NH_2OH$). 1. Reaction with Hydrogen Cyanide (HCN): Hydrogen cyanide undergoes nucleophilic addition reactions with compounds containing a carbonyl group ($C=O$), specifically aldehydes and ketones, to form cyanohydrins. Alkanones* (ketones) have a $C=O$ group and react with HCN. Alkanals* (aldehydes) have a $C=O$ group and react with HCN. Alkanoic acids* have a $C=O$ group as part of a carboxyl group ($COOH$), but their carbonyl carbon is less reactive towards nucleophilic addition compared to aldehydes and ketones, so they generally do not form cyanohydrins. Alkenes* have a carbon-carbon double bond ($C=C$) but no $C=O$ group, so they do not react with HCN in this manner. 2. Reaction with Hydroxylamine ($NH_2OH$): Hydroxylamine reacts with compounds containing a carbonyl group ($C=O$), specifically aldehydes and ketones, to form oximes. This is a nucleophilic addition-elimination reaction. Alkanones* (ketones) have a $C=O$ group and react with $NH_2OH$. Alkanals* (aldehydes) have a $C=O$ group and react with $NH_2OH$. Alkanoic acids* do not typically react with hydroxylamine to form oximes at the carboxyl carbon. Alkenes* have no $C=O$ group, so they do not react with $NH_2OH$ to form oximes. Based on this analysis: Alkanones and Alkanals react with both HCN and $NH_2OH$. Alkanoic acids generally do not undergo these specific reactions. Alkenes do not have a carbonyl group ($C=O$) and therefore do not undergo these characteristic reactions with either HCN or $NH_2OH$. Thus, an alkene is the compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine. The correct option is B.