Which of the following does not illustrate resonance between the structures?

1.
2.
3.
4.

The IUPAC name of the above-given compound is:

1.  2,3,4-Trimethyl-3-(1-Methyl ethyl)pent-2-ene

2.  2,3,3-Trimethyl-3-(1-Methyl propyl)pent-2-ene

3.  2,3,4-Trimethyl-2-(1-Methyl ethyl)pent-2-ene

4.  2,4,4-Trimethyl-3-(1-Methyl ethyl)pent-2-ene

0.3 g of organic compound contains 40 % bromine in silver bromide by the Carius method, the mass of silver bromide is:

Addition of K₄[Fe(CN)₆] solution to FeCl₃ solution gives: 

1. Fe₂[Fe(CN)₆]

2. Fe₄[Fe(CN)₆]₃

3. Fe₃[Fe(CN)₆]₄

4. Fe[Fe(CN)₆]₂

Paper chromatography is an example of:

1. Partition chromatography

2. Thin layer chromatography

3. Column chromatography

4. Adsorption chromatography

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because-

1. + R effect of ${CH}_3$ groups 

2. $-$R effect of $-$ CH₃  groups 

3. Hyperconjugation 

4. $-$l effect of $-$CH₃ groups 

Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so, it:

1. Helps in the precipitation of AgCl

2. Increases the solubility product of AgCl

3. Increases the concentration of NO₃^- ions

4. Decomposes Na₂S and NaCN, if formed.

The number of unbranched straight-chain molecules with different structural formulas for the molecular formula ${\mathrm{C}}_4{\mathrm{H}}_8{\mathrm{F}}_2$ are: 

The most stable carbocation among the following is:

1.		2.
3.		4.