A) $ HgSO _4/H _2SO _4 $
B) $ Cu _2Cl _2 $
C) $ H _3PO _2 $ और $ H _2O $
D) $ {H^{+}}/H _2O $
सही उत्तर: C
जब डायजोनियम लवण को ${H_3}P{O_2}$ के साथ उपचारित किया जाता है और तत्पश्चात् जलअपघटन किया जाता है,
तो डायजोनियम समूह को ?H द्वारा प्रतिस्थापित किया जाता है जिससे हाइड्रोकार्बन का निर्माण होता है।
इस प्रकार, A अवश्य ही ${H_3}P{O_2}\text{/},{H_2}O\text{ होना चाहिए।}$
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