Question

# How many alcohol isomers are possible for the formula ${ C }_{ 4 }{ H }_{ 10 }{ O }$?a.) ${ 4 }$b.) ${ 2 }$c.) ${ 3 }$d.) ${ 7 }$

Hint: The existence of two or more compounds with the same molecular formula but the different structural formula is known as isomerism; and the compounds themselves are called isomers.

Geometrical isomerism: It is defined as a chemical compound having a similar molecular formula as another yet a different geometric configuration, as when atoms or groups of atoms are attached in various spatial arrangements on either side of a bond or a ring.
There are four geometrical isomers of ${ C }_{ 4 }{ H }_{ 10 }{ O }$ which are given below:

1. Butan-1-ol:

2. Butan-2-ol:

3. 2-Methyl propan-1-ol:

4. Methyl propan-2-ol:

As there are four alcohol isomers of ${ C }_{ 4 }{ H }_{ 10 }{ O }$. Hence, the correct option is A.
So, the correct answer is “Option A”.

Note: The possibility to make a mistake is that there are seven isomers of ${ C }_{ 4 }{ H }_{ 10 }{ O }$ in which four are alcoholic and 3 are ether isomers. Here, in this question alcohol isomers are asked so in spite of seven, there are four alcohol isomers.