Which of the following carbocation will undergo rearrangement ?

1.  

2.

$3. {\mathrm{CH}}_3-\underset{ |}{\mathrm{C}}$
${\mathrm{CH}}_3\mathrm{H}-\stackrel{\oplus }{\mathrm{C}}=\mathrm{O}$

$4. {\mathrm{CH}}_3-\mathrm{NH}-\stackrel{\oplus }{\mathrm{C}}\mathrm{H}-\underset{|}{\mathrm{C}}$
${\mathrm{CH}}_2\mathrm{H}-{\mathrm{CH}}_3$

The colour of the solution that gets formed by mixing sodium nitroprusside to an alkaline solution of sulfide ions, is-

The Prussian blue colour obtained during the test of nitrogen by Lassaigne's test is due to the formation of-

A compound that does not give a positive test in Lassaigne’s test for nitrogen is:

1. Urea

2. Hydrazine

3. Azobenzene

4. Phenylhydrazine

The IUPAC name of the below given compound is: 
 

1. Ethyl 2-methylprop-2-enoate

2. Ethyl 2-methylprop-1-enoate

3. 1-Ethoxy 2-methylprop-2-enoate

4. 1-Ethoxy 2-methylprop-2-enal

The IUPAC name of the given compound is:

1. 2-Phenylpropan-3-al

2. Formylethylbenzene

3. 2-Phenylpropanal

4. Ethylformylbenzene

The IUPAC name of the given compound is:
 
  

1. Ethanoic propanoic anhydride

2. Propanoic ethanoic anhydride

3. 1-Ethanoyloxypropanone

4. 3-Ethanoyloxypropan-3-one

The IUPAC name of  the given-below compound is:

1. Butane-2,3-dial

2. Butane-1,3-dione

3. Butane-2,3-dione

4. 1, 2-Dimethylethanedione

The IUPAC name of     is:

1. (N-Bromo)-2-keto-3-methylbutanamide

2. (Bromo) -2-keto-4-methylbutanamide

3. (N-Bromo)-1, 2-diketo-3-methylbutanamine carboxamide

4. (N-Bromo)-1-keto-2-methylpropane

The IUPAC name of  is:

1. 2, 6-Dimethylhepta-2, 5-dienoic acid

2. 3, 7-Dimethylhepta-2, 5-dienoic acid

3. 1-Hydroxy-2, 6-dimethylhepta-2, 5-dienone

4. None of the above