Answer
1-butanol and 2-methyl-1-butanol are primary alcohol
2-butanol is a secondary alcohol
2-methyl-2-butanol is a tertiary alcohol
Work Step by Step
a. root name is 'but'. draw 4 C in straight chain and numbering them from 1 to 4. ending name is 'anol' and 1-butanol means OH group is present at C1 position. Place OH group at C1 carbon and remaining valency of C atoms is filled with H.
This is a primary alcohol because the C bonded with OH is attached with two H atoms.
b. root name is 'but'. draw 4 C in straight chain and numbering them from 1 to 4. ending name is 'anol' and 2-butanol means OH group is present at C2 position. Place OH group at C2 carbon and remaining valency of C atoms is filled with H.
This is a secondary alcohol because the C bonded with OH is attached with only one H atom.
c. root name is 'but'. draw 4 C in straight chain and numbering them from 1 to 4. ending name is 'anol' and 1-butanol means OH group is present at C1 position. Place OH group at C1 carbon. '2-methyl' means one methyl group is present as a substituent at C2 position and remaining valency of C atoms is filled with H.
This is a primary alcohol because the C bonded with OH is attached with two H atoms.
d. root name is 'but'. draw 4 C in straight chain and numbering them from 1 to 4. ending name is 'anol' and 2-butanol means OH group is present at C2 position. Place OH group at C2 carbon. '2-methyl' means one methyl group is present as a substituent at C2 position and remaining valency of C atoms is filled with H.
This is a tertiary alcohol because the C bonded with OH is not attached with any H.
