Which of the following does not react with sodium bisulphite ?

III and IV

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II and IV

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All reacts

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Solution

The correct option is B
II and IV

In addition of sodium bisulphite, the nucleophile is bisulphite ion which, being a large ion, reacts only if C = O group is not sterically hindered. Thus $C H_{3} C O C_{2} H_{5}$ and $C_{6} H_{5} C O C H_{3}$ , having larger group like - $C H_{2} C H_{3}$ and $- C_{6} H_{5}$ , do not react with $N a H S 0_{3}$

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Which of the following does not react with sodium bisulphite ?

The correct option is B II and IV In addition of sodium bisulphite, the nucleophile is bisulphite ion which, being a large ion, reacts only if C = O group is not sterically hindered. Thus CH3COC2H5 and C6H5COCH3, having larger group like - CH2CH3 and −C6H5, do not react with NaHS03