Nomenclature Of Organic Compounds

The correct option is (B): But-1-ene.

Step 1: Understanding the preparation of borax.
Borax is a chemical compound commonly used in various industrial and household applications. It is primarily prepared from washing soda (sodium carbonate decahydrate, ) and boric acid ( ). Step 2: Reaction.
The preparation involves the reaction of sodium carbonate with boric acid: Step 3: Conclusion.
Thus, washing soda is used in the preparation of borax.

Step 1: Definition of Amines.
Amines are organic compounds in which one or more hydrogen atoms in ammonia (NH ) are replaced by alkyl or aryl groups. The general formula for an amine is RNH , where R represents an alkyl group. Step 2: Formation of Amines.
When a hydrogen atom is replaced by an alkyl group in ammonia (NH ), the resulting compound is an amine. For example, methylamine (CH NH ) is formed by replacing one hydrogen atom of ammonia with a methyl group (CH ). Step 3: Conclusion.
Therefore, the compounds formed when a hydrogen atom is replaced by an alkyl group in ammonia are amines.

Step 1: Understanding the structure.
The given compound CH CHO is an aldehyde group (–CHO) attached to a methyl group (–CH ). Step 2: IUPAC naming.
The IUPAC name for CH CHO is ethanol because the compound consists of two carbon atoms and the functional group is an aldehyde. Step 3: Explanation.
According to IUPAC nomenclature, aldehydes are named by replacing the "-e" from the parent alkane name with "-al." Since CH CHO is derived from ethane, the IUPAC name is ethanol. Step 4: Conclusion.
Thus, the IUPAC name of CH CHO is ethanol.