Choose the incorrect option:

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(B) Option $B$ is incorrect because primary amines $(R-NH_2)$ possess two hydrogen atoms attached to the nitrogen,which allows for extensive intermole

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Tertiary amines $(Me_3N)$ have higher boiling point than primary amine $(MeNH_2)$.

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(B) Option $B$ is incorrect because primary amines $(R-NH_2)$ possess two hydrogen atoms attached to the nitrogen,which allows for extensive intermolecular hydrogen bonding. Tertiary amines $(R_3N)$ lack hydrogen atoms on the nitrogen,preventing intermolecular hydrogen bonding. Therefore,primary amines have significantly higher boiling points than tertiary amines of comparable molar mass.Option $A$ is correct: $2,2,6-$trimethylcyclohexanone is sterically hindered,making nucleophilic attack by $CN^-$ difficult.Option $C$ is correct: Aniline is a weaker base than methylamine due to the delocalization of the lone pair on nitrogen into the benzene ring,resulting in a higher $pK_b$ value.Option $D$ is correct: $PCC$ (Pyridinium chlorochromate) is a selective oxidizing agent that oxidizes primary alcohols to aldehydes without further oxidation to carboxylic acids.

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