Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store
seo-qna
SearchIcon
banner

The number of structurally isomeric esters with molecular formula C5H10O2 are
A) 3
B) 5
C) 6
D) 8

Answer
VerifiedVerified
479.7k+ views
like imagedislike image
Hint: Using the given molecular formula of ester determines the degrees of unsaturation. Ester is a carboxylic derivative of acid. The general formula of the ester is RCOOR'. Isomers are the compound having the same molecular formula but a different structural arrangement.


 Complete solution:
We have to determine the structural isomers of ester having molecular formulaC5H10O2.
To determine the structures of isomers we have to determine the index of hydrogen deficiency (IHD) which is also known as units of unsaturation using the following formula.
IHD = 0.5×[2c + 2 - h - x + n]
Where,
c = number of carbon atoms = 5
h = number of hydrogen atoms = 10
x = number of halogen atoms = 0
n = number of nitrogen atoms = 0
IHD = 0.5×[2×5 + 2 - 10 - 0 + 0]
IHD = 1
This indicates that ester having molecular formulaC5H10O2 contains one double bond of carbonyl carbon.
The general structure of ester is
seo images

Here, R and R’ are two different alkyl groups. By using a different type of alkyl groups we can draw the different isomers of ester having a formulaC5H10O2 as follows:

seo images



Structure I
Now we will keep COOCH3 the group fix and will write the other possible isomers.
seo images


Structure II
seo images

Now we will write the isomers having a different OR’ group.


Structure III
seo images



Structure IV

seo images



 So, there are 5 isomeric esters possible having molecular formula C5H10O2 .

Hence, the option (B) is the correct answer to the question.


Note: Ester is one of the organic functional groups. The molecular formula of all isomers is the same only the arrangement of bonding atoms is different. Ester contains two types of alkyl groups. One alkyl group bonded to carbonyl carbon and one alkyl bonded to the oxygen atom of the carboxylate group. By varying the alkyl groups we can draw all possible isomers of ester.


Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
calendar iconAcademic year 2025-26
language iconENGLISH
book iconUnlimited access till final school exam
tick
School Full course for CBSE students
PhysicsPhysics
ChemistryChemistry
MathsMaths
₹41,848 per year
Select and buy