Which of the following is the most stable alkene?

The metal used for the de-bromination reaction of $1, 2$-dibromoethane is:

Propene,$CH_3-CH=CH_2$ can be converted to $1-propanol$ by oxidation. Which set of reagents among the following is ideal to effect the conversion?

The major product of the following reaction is $CH_3-CH(Br)-CH_2-CH_3 + \text{alc. } KOH \to $

What is the product formed when glycerol reacts with excess $HI$?

Give the increasing order of stability for the following alkenes based on their heat of hydrogenation $(\Delta H^o)$:
$(I) (CH_3)_2C = C(CH_3)_2$
$(II) CH_3CH_2CH_2CH = CH_2$
$(III) (CH_3)_2C = CHCH_3$
$(IV) CH_3CH_2C(CH_3) = CH_2$