Question

Write structures of different isomeric alkyl groups corresponding to the molecular formula $C_5{H}_{11}$. Write IUPAC name of alcohols obtained by attachment of $-OH$ groups at different carbons of the chain.

Answer 1

Step 1: Possible isomeric structure of $C_5{H}_{11}$

Different isomeric alkyl groups corresponding to
the molecular formula $C_5{H}_{11}$ can be given as –



Step 2: Corresponding isomeric alcohols
(i)

Structure of $C_5{H}_{11}$
Corresponding Alcohols
Name of Alcohol	Pentan-1-ol

(ii)

Structure of $C_5{H}_{11}$ group
Corresponding Alcohols
Name of Alcohol	Pentan-2-ol

(iii)

Structure of $C_5{H}_{11}$ group
Corresponding Alcohols
Name of Alcohol	Pentan-3-ol

(iv)

Structure of $C_5{H}_{11}$ group
Corresponding Alcohols
Name of Alcohol	3-Methyl-butan-1-ol

(v)

Structure of $C_5{H}_{11}$ group
Corresponding Alcohols
Name of Alcohol	2-Methyl-butan-1-ol

(vi)

Structure of $C_5{H}_{11}$ group
Corresponding Alcohols	​​​​​​​
Name of Alcohol	2-Methyl-butan-2-ol

(vii)

Structure of $C_5{H}_{11}$ group
Corresponding Alcohols	​​​​​​​​​​​​​​
Name of Alcohol	2,2-Dimethyl-propan-1-ol

(viii)

Structure of $C_5{H}_{11}$ group
Corresponding Alcohols	​​​​​​​​​​​​​​​​​​​​​
Name of Alcohol	3-methyl-butan-2-ol