Q. No.The reddish-brown precipitate formed in Fehling's test for aldehydes (RCHO) is due to the formation of the following compound :
1. \(\mathrm{Cu}\)
2. \(\mathrm{Cu}_2 \mathrm{O}\)
3. \(\mathrm{CuO}\)
4. \((\mathrm{RCOO})_2 \mathrm{Cu}\)
1. \(\mathrm{Cu}\)
2. \(\mathrm{Cu}_2 \mathrm{O}\)
3. \(\mathrm{CuO}\)
4. \((\mathrm{RCOO})_2 \mathrm{Cu}\)
2. 
4. 
4-Formylbenzoic acid on treatment with one equivalent of hydrazine followed by heating with alcoholic KOH gives, as major product:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
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In the given below reaction
x, y, and z are:
1. x = Mg; dry ether; y =
2. x = Mg; dry methanol;
3. x = Mg; dry ether;
4. x = Mg; dry methanol;
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2. 
4. 
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Three isomeric compounds M, N and P () give the following tests
i. M and P react with sodium bisulfite to form an adduct.
ii. N consumes 1 mol of bromine and also gives turbidity with conc. HCl/anhydrous after prolonged heating.
iii. M reacts with an excess of iodine in an alkaline solution to give a yellow crystalline compound with a characteristic smell.
iv. p-Rosaniline treated with sulfur dioxide develops pink color on shaking with P.
The structures of M, N, and P, respectively are
M N P
1. 
2. 
3. 
4. 
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The correct order of acidity of the following compounds is:
1. 1 > 2 > 3
2. 1 > 3 > 2
3. 3 > 1 > 2
4. 3 > 2 > 1
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