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(B) Reductive ozonolysis of an alkene $R_1R_2C=CR_3R_4$ yields carbonyl compounds. Formaldehyde $(HCHO)$ is produced if the alkene contains a terminal

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$3$

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(B) Reductive ozonolysis of an alkene $R_1R_2C=CR_3R_4$ yields carbonyl compounds. Formaldehyde $(HCHO)$ is produced if the alkene contains a terminal methylene group $(=CH_2)$.Let's analyze the given structures:$1$. $1$-butene $(CH_3CH_2CH=CH_2)$: Contains $=CH_2$,produces $HCHO$.$2$. $2$-butene $(CH_3CH=CHCH_3)$: No $=CH_2$,produces $CH_3CHO$.$3$. $2$-methyl-$1$-butene $(CH_3CH_2C(CH_3)=CH_2)$: Contains $=CH_2$,produces $HCHO$.$4$. Cyclopentene: No $=CH_2$,produces a dialdehyde.$5$. Cyclobutene: No $=CH_2$,produces a dialdehyde.$6$. $1$-methylcyclopropene: No $=CH_2$,produces a keto-aldehyde.$7$. Methylenecyclopropane: Contains $=CH_2$,produces $HCHO$.$8$. $1$-methylcyclopropene (isomer): No $=CH_2$.$9$. Cyclohexene: No $=CH_2$,produces a dialdehyde.Compounds producing $HCHO$ are: $1$-butene,$2$-methyl-$1$-butene,and methylenecyclopropane.Total count = $3$.

How many of the following compounds on reductive ozonolysis produce formaldehyde $(HCHO)$ as one of the products? The compounds are: $1$-butene,$2$-butene,$2$-methyl-$1$-butene,cyclopentene,cyclobutene,$1$-methylcyclopropene,methylenecyclopropane,$1$-methylcyclopropene (isomer),and cyclohexene.

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