Question

An alkene on ozonolysis gives methanal as one of the products. Its sturcture is:

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

During ozonolysis, an alkene is oxidised in such a way that $C=C$ bond is broken and each $C$ gets a new bond $-C=O$. Here, methanal can only be formed if the double bond is with a terminal $C$ atom so that after reaction, it gets converted into $H_{2}C=O$. See for the terminal carbon:

And for general reaction, the mechnism is as follows:Hence, (a) is the correct option.