A) \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\]and \[NaOH\]
B) \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\]and dil. \[{{H}_{2}}S{{O}_{4}}\]
C) \[NaOH\]
D) Fe in presence of \[\text{NaOH}\]
Correct Answer: B
Solution :
Key Idea: \[{{1}^{o}}\]alcohol are converted into aldehyde by reaction with \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\]and \[{{H}_{2}}S{{O}_{4}}\] \[\underset{\text{ethyl}\,\text{alcohol}\,}{\mathop{C{{H}_{3}}C{{H}_{2}}OH}}\,+[O]\xrightarrow{N{{a}_{2}}C{{r}_{2}}{{O}_{7}}+{{H}_{2}}S{{O}_{4}}}\] \[\underset{\text{ethanal}}{\mathop{C{{H}_{3}}CHO}}\,\,+\,{{H}_{2}}O\]
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