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

 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. \((\mathrm{RCOO})_2 \mathrm{Cu}\)

The major final product in the following reaction is

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CN}\underset{\left(2\right){\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(1\right){\mathrm{CH}}_3\mathrm{MgBr}}{\to }}$

1.        2.  

3.       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.

In the given below reaction

x, y, and z are: 

1.  x = Mg; dry ether; y = ${\mathrm{CH}}_3\mathrm{Cl}; \mathrm{z} = {\mathrm{H}}_2\mathrm{O}$

2.  x = Mg; dry methanol; $\mathrm{y} = {\mathrm{CO}}_2; \mathrm{z} = \mathrm{dil}.\mathrm{HCl}$

3.  x = Mg; dry ether; $\mathrm{y} = {\mathrm{CO}}_2; \mathrm{z} = \mathrm{dil}.\mathrm{HCl}$

4.  x = Mg; dry methanol; $\mathrm{y} = {\mathrm{CH}}_3\mathrm{Cl}; \mathrm{z} = {\mathrm{H}}_2\mathrm{O}$

In the following reactions

1.  

2.  

3.  

4.  

The major product formed in the following reaction is:

1.		2.
3.		4.

The main product X formed in the following reaction is

1.        2.  

3.    4.  

Three isomeric compounds M, N and P (${\mathrm{C}}_5{\mathrm{H}}_{10}\mathrm{O}$) 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 ${\mathrm{ZnCl}}_2$ 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.  

The major product in the following reaction is: 

1.		2.
3.		4.