The ozonolysis products of an olefin are $CHO-CHO$ and $CHO-CH_2-CH_2-CHO$. The olefin is:

The general formula of alkenes is:

Describe the structure of the carbon-carbon double bond in alkenes.

Two isomers $A$ and $B$ with molecular formula $C_4H_8$ give different products on oxidation with $KMnO_4$ in acidic medium. Isomer $A$ on reaction with $KMnO_4 / H^{+}$ results in effervescence of a gas and gives a ketone. The compound $A$ is ...... .

Dilute aqueous $KMnO_4$ at room temperature reacts with $R-CH=CH-R$ to give:

An alkene $A$ (molecular formula $C_{5}H_{10}$) on ozonolysis gives a mixture of two compounds $B$ and $C$. Compound $B$ gives a positive Fehling's test and also forms iodoform on treatment with $I_{2}$ and $NaOH$. Compound $C$ does not give Fehling's test but forms iodoform. Identify the compounds $A, B$ and $C$. Write the reaction for ozonolysis and the formation of iodoform from $B$ and $C$.