Which one of the following process requires an oxidizing agent to occur?

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${SO}_{2} \overset{}{\to} {SO}_{4}^{- 2}$

${CrO}_{4}^{- 2} \overset{}{\to} {Cr}_{2} O_{7}^{- 2}$

${NO}_{3}^{-} \overset{}{\to} N_{2} O$

$C_{2} H_{4} \overset{}{\to} C_{2} H_{6}$

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Detailed Solution

$\overset{+ 4}{S} O_{2} \overset{}{\to} \overset{+ 6}{S} O_{4}^{- 2}$ …….oxidation…..requires oxidizing agent

$\overset{+ 6}{Cr} O_{4}^{- 2} \overset{}{\to} {\overset{+ 6}{Cr}}_{2} O_{7}^{- 2}$ ……………….no change is oxidation state

$\overset{+ 5}{N} O_{3}^{-} \overset{}{\to} {\overset{+ 1}{N}}_{2} O$ …… reduction … requires reducing agent

$\overset{- 2}{C_{2}} H_{4}^{} \overset{}{\to} \overset{- 3}{C_{2}} H_{6}$ …… reduction …requires reducing agent

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