Question

According to carbinol system, name of isopropyl alcohol is

• A. Methyl carbinol
• B. Ethyl carbinol
• C. Dimethyl carbinol
• D. Isopropyl carbinol

Hint:

Chemistry Tip: To name any alcohol in this system, simply replace the "-OH" and its carbon with the word "carbinol" and name the remaining alkyl groups as prefixes.

Answer 1

The Correct Option is C

Concept: Chemistry (Organic Chemistry) - Carbinol System of Nomenclature.

Step 1: Understand the Carbinol system. In the Carbinol system of nomenclature, all alcohols are considered derivatives of the simplest alcohol, methanol ($CH_3OH$), which is referred to as "carbinol". The carbon atom attached to the hydroxyl group is designated as the carbinol carbon.

Step 2: Identify the structure of isopropyl alcohol. Isopropyl alcohol (IUPAC: propan-2-ol) has the structural formula $CH_3-CH(OH)-CH_3$. The central carbon is the one carrying the functional group.

Step 3: Identify the carbinol unit. Locate the $C-OH$ unit in the molecule. This central $CH-OH$ part represents the "carbinol" core where the hydrogens of the original methanol have been replaced by other groups.

Step 4: Identify the substituents attached to the carbinol carbon. Looking at the structure $CH_3-[CH(OH)]-CH_3$, we can see that there are two methyl ($-CH_3$) groups directly attached to the carbinol carbon.

Step 5: Assemble the name. Since there are two methyl groups attached to the carbinol core, the compound is named as "Dimethyl carbinol". $$ \therefore \text{The carbinol name for isopropyl alcohol is Dimethyl carbinol.} $$