Some Basic Concepts of Chemistry

Among the following, the highest value of prefix is:
Given the numbers $$786$$, $$0.786$$ and $$0.0786$$. The number significant figures for the numbers is :
Given the numbers $$786$$, $$0.786$$ and $$0.0786$$. The number significant figures for the numbers is :
Vapor pressure is-------------dependent property.
The main constituent of LPG is butane. Then
(A) Butane can be liquefied easily under high pressure
(B) Butane is liquefied by chemically reacting with ethane and propane.