Addition of $OsO_4$ to cyclopentene would give a product which is

Which one is more reactive between alkane and alkene? Why?

The major product in the following reaction is:

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

Dalda is prepared from oils by

For the following reactions,the major products are shown: $H_2C=CH-CH=CH_2$ $\xrightarrow[0^\circ C]{HBr} CH_2=CH-CH(Br)-CH_3$ $\xrightarrow{25^\circ C} Br-CH_2-CH=CH-CH_3$. These provide an example of $1$ control at low temperature and $2$ control at higher temperature.