Ethylene reacts with ozone to give

What do you mean by olefin? Give an example.

Which of the following reagents is used to convert propene to propan-$1$-ol?

On vigorous oxidation by permanganate solution,$(CH_3)_2C = CH - CH_2CH_2CH_3$ gives:

Alkenes react with water in the presence of acid to form alcohols. Identify the steps involved in the mechanism of the reaction from the following :
a) Nucleophilic addition of hydroxide ion to alkene
b) Protonation of alkene by electrophilic attack of $H_3O^{+}$
c) Electrophilic attack of $H_2O$ on carbanion
d) Nucleophilic attack of $H_2O$ on carbocation
e) Loss of $^{\ominus}OH$ to form an alcohol
f) Loss of $H^{\oplus}$ to form an alcohol

Arrange $HI$,$HCl$,$HBr$,and $HF$ in increasing order of rate of reaction with alkene.