A sample of 0.50 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50 mL of 0.5 M ${\mathrm{H}}_2{\mathrm{SO}}_4$. The residual acid required 60 mL of 0.5 M solution of NaOH for neutralization. The percentage composition of nitrogen in the compound is:

1.	52%	2.	61%
3.	56 %	4.	54 %

In the organic compound
$$CH₂=CH–CH₂–CH₂–C≡CH, which pair of hybridized orbitals is involved in forming the C₂–C₃ bond?
1. sp – ${\mathrm{sp}}^2$ 

2. sp – ${\mathrm{sp}}^3$

3. ${\mathrm{sp}}^2$ – ${\mathrm{sp}}^3$

4. ${\mathrm{sp}}^3$ – ${\mathrm{sp}}^3$

The correct statement regarding ambident nucleophiles is:

1. Nucleophiles have equal atomic weight.

2. Nucleophiles have only five electrons.

3. Nucleophiles have two nucleophilic sites.

4. Nucleophiles have two electrophilic sites.

Regardless of the specific technique used (GC, HPLC, TLC, etc.), what is the fundamental mechanism required for all chromatographic separations to occur?

1. Use of molecules that are soluble in water

2. Use of inert carrier gas

3. Calculation of R_f value for the molecule separated

4. Use of a mobile and a stationary phase

The number of σ and π bonds in the molecule $C_6{H}_6$ are -

The number of σ and π bonds in the molecule $C_6{H}_{12}$ are:

1. 7 = (${\sigma }_{C-C})$ , 11 =  $\left({\sigma }_{C-H}\right)$, and 0= π 

2. 6 = (${\sigma }_{C-C})$ , 12 =  $\left({\sigma }_{C-H}\right)$, and 0= π 

3. 12 = (${\sigma }_{C-C})$ , 6 =  $\left({\sigma }_{C-H}\right)$, and 1= π 

4. 5 = (${\sigma }_{C-C})$ , 13 =  $\left({\sigma }_{C-H}\right)$, and 1= π 

Which among the following is the correct IUPAC name ?

The correct IUPAC name of the following structure is

The  IUPAC name of the following molecule is -

$\stackrel{1}{C}{H}_2$ $=\stackrel{2}{C}=O$

The correct hybridization states of carbon atoms in the above compound are -