What is the alteration in the oxidation state of carbon in the given reaction?

\({CH_4}_{(g)} + 4{Cl_2}_{(g)} \rightarrow {CCl_4}_{(l)} + 4 HCl_{(g)}\)

1. 0 to +4

2. -4 to +4

3. 0 to -4

4. +4 to +4

The incorrect oxidation number of the underlined atom in the following species is:

The oxidation state of Cr in ${\mathrm{CrO}}_6$ is -