Molar mass of the hydrocarbon (X) which on ozonolysis consumes one mole of O3 per mole of (X) and gives one mole each of ethanol and propanone is:

Given: The hydrocarbon (X) consumes one mole of O3 per mole of (X) on ozonolysis and gives one mole each of ethanol and propanone. Find: The molar mass of (X). From the given reaction in the solution: CH3- C CH- CH3 + O3 CH3 CHO + CH3 COCH3 Thus, the hydrocarbon (X) is pent-2-yne with molecular formula C5H8. Its molecular mass is: 5 12 + 8 1 = 70 g mol^-1 Therefore, the molar mass of the hydrocarbon is 70 g mol^-1.

Molar mass of the hydrocarbon (X) which on ozonolysis consumes on… — Solution | JEE Chemistry

NVAEasyJEE 2023Alkynes (Acidic Nature, Reactions)

Molar mass of the hydrocarbon $\left(X\right)$ which on ozonolysis consumes one mole of $O_3$ per mole of $\left(X\right)$ and gives one mole each of ethanol and propanone is:

Answer

Correct answer:70

Step-by-step solution

Standard Method

Given: The hydrocarbon $\left(X\right)$ consumes one mole of $O_3$ per mole of $\left(X\right)$ on ozonolysis and gives one mole each of ethanol and propanone.

Find: The molar mass of $\left(X\right)$ .

From the given reaction in the solution:

\text{CH}_3-\text{C}\equiv\text{CH}-\text{CH}_3 + \text{O}_3 \to \text{CH}_3\text{CHO} + \text{CH}_3\text{COCH}_3

Thus, the hydrocarbon $\left(X\right)$ is pent-2-yne with molecular formula $C_5H_8$ .

Its molecular mass is:

5 \times 12 + 8 \times 1 = 70 \, \text{g mol}^{-1}

Therefore, the molar mass of the hydrocarbon is $70 \, \text{g mol}^{-1}$ .

Common mistakes

Identifying the hydrocarbon incorrectly from the ozonolysis products is a common mistake. This is wrong because the products must be matched to the correct alkyne skeleton. Use the given ethanol and propanone fragments to reconstruct the parent hydrocarbon carefully.
Using the wrong molecular formula for pent-2-yne can lead to an incorrect molar mass. This is wrong because alkynes follow the formula $C_nH_{2n-2}$ . For $n=5$ , use $C_5H_8$ before calculating the mass.

Practice more Alkynes (Acidic Nature, Reactions) questions

Get unlimited AI-adaptive practice, mastery tracking, and an AI tutor that explains every step — free to start.

Start free trial More on Alkynes (Acidic Nature, Reactions)

Answer

Step-by-step solution

Common mistakes

Practice more Alkynes (Acidic Nature, Reactions) questions

Related questions