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Q. The number of carbonyl carbon in the product $X$ is
Propyne $\xrightarrow [Zn / H_{2} O]{O_{3} / CH_{2} Cl_{2} , \Delta }X$

NTA AbhyasNTA Abhyas 2022

Solution:

Ozonolysis of propyne results in the formation of $2$ -oxopropanal which contains keto group and aldehyde $\left(-CHO\right)$ group. Hence, $2$ -oxopropanal contains two carbon atoms.
Solution