methyl butane. Don't forget to use capital letters when writing formulae.
it's a hydrocarbon called Petroleum ether
It is the organic molecyle called Pentan
Propene
Heptane
... addition reaction; the hydrogen molecule is split, one of its atoms is added to each carbon atom that is initially double bonded, and an alkene becomes an alkane. --- ... known as hydrogenation.
That just means that you have two of CH in line together, it looks like this: CH3CH2CHCHCH3 There is a double bond between those two CH's.