Question
Semicarbazide formula is (____).
Answer
Semicarbazide formula is (H2N–NH–C(O)NH2).
Note: Certain primary amine derivatives condense with aldehydes and ketones to form products
that are less hydrolytically unstable than ordinary imines. Among these are hydroxylamine;
hydrazine, H2NNH2, and its derivatives, such as 2,4-dinitrophenylhydrazine; and semicarbazide.
Note: Upon exposure to an amine, aldehydes and ketones initially form hemiaminals, the nitrogen analogs of hemiacetals. In a subsequent, slower step, hemiaminals of primary amines lose water to form a carbon–nitrogen double bond. This function is called an imine (an older name is Schiff* base) and is the nitrogen analog of a carbonyl group.
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A ____ has two alkyl groups bonded to the carbonyl.
____ has one alkyl group and one hydrogen bonded to a carbonyl.
Aryl is any functional group or substituent derived from ____ .
____ is any functional group or substituent derived from an aromatic ring .
____ are named by replacing the – e at the end of the alkane name with the suffix – al .
Aldehydes are named by replacing the ____.