The addition of $HI$ to the double bond of propene gives isopropyl iodide as the major product because the addition proceeds through:

The alkene that gives only acetone upon ozonolysis is .......

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 $C$.

What product is formed when the alkene $R-CH=CH_2$ reacts with $B_2H_6$ in the presence of $H_2O_2$?

Which reactions are most common in alkenes?

Hydration of $3$-phenylbut$-1$-ene in dil. $H_2SO_4$ will give mainly