Which of the following is the largest: Astronomical Unit,Light Year,or Parsec?

Match the items in Column-$I$ with their corresponding values in Column-$II$.

Column-$I$	Column-$II$
$(1)$ Light year	$(a)$ $3.08 \times 10^{16} \ m$
$(2)$ Parsec	$(b)$ $9.46 \times 10^{15} \ m$
$(3)$ $1 \ AU$	$(c)$ $1.496 \times 10^{11} \ m$

Explain this statement clearly: "To call a dimensional quantity 'large' or 'small' is meaningless without specifying a standard for comparison". In view of this,reframe the following statements wherever necessary:
$(a)$ atoms are very small objects
$(b)$ a jet plane moves with great speed
$(c)$ the mass of Jupiter is very large
$(d)$ the air inside this room contains a large number of molecules
$(e)$ a proton is much more massive than an electron
$(f)$ the speed of sound is much smaller than the speed of light.

If $1 \ gm \ cm \ s^{-1} = x \ Ns$,then $x = $

What is the ratio of one micron to one nanometer?

Which of the following is not a unit of distance?