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Q.

A compound (X) when heated with con H2SO4 gives one gaseous product, which under pressure forms sodium methanoate with NaOH. 
How many of the list 
–HCOOH, K4Fe(CN)6.H2C2O4, CH2(COOH)2 can be (X)?

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answer is 2.

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Detailed Solution

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HCOOH and K4Fe(CN)6

HCOOH releases carbon monoxide when heated with conc. H2SO4 and then while treatment with NaOH (under pressure), it forms sodium methanoate.

K4Fe(CN)6  also releases carbon monoxide when heated with conc. H2SO4 and then while treatment with NaOH (under pressure), it forms sodium methanoate.

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A compound (X) when heated with con H2SO4 gives one gaseous product, which under pressure forms sodium methanoate with NaOH. How many of the list –HCOOH, K4Fe(CN)6.H2C2O4, CH2(COOH)2 can be (X)?