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 = ${\mathrm{CH}}_3\mathrm{Cl};<mspace\; width="1em"></mspace>\mathrm{z}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{O}$

2.  x = Mg; dry methanol; $\mathrm{y}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{CO}}_2;<mspace\; width="1em"></mspace>\mathrm{z}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>\mathrm{dil}.\mathrm{HCl}<mspace\; width="1em"></mspace>$

3.  x = Mg; dry ether; $\mathrm{y}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{CO}}_2;<mspace\; width="1em"></mspace>\mathrm{z}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>\mathrm{dil}.\mathrm{HCl}$

4.  x = Mg; dry methanol; $\mathrm{y}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{CH}}_3\mathrm{Cl};<mspace\; width="1em"></mspace>\mathrm{z}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{O}$

In the following reactions

1.  

2.  

3.  

4.  

The main product X formed in the following reaction is

1.        2.  

3.    4.  

The major product in the following reaction is: 

1.		2.
3.		4.

The Wolf Kishner's reduction cannot be applied to:

1.		2.
3.		4.

1.             

2.  

3.       

4.