The dihedral angle of the least stable conformer of ethane is:

1.	60°	2.	0°
3.	120°	4.	180°

The major product of the following chemical reaction is:

1.
2.
3.
4.

Reactant A in the following reaction is-

A  + NaOH \(\xrightarrow[\Delta ]{CaO}\) CH₃CH₂CH₃ + Na₂CO₃

1. Sodium ethanoate

2. Sodium propanoate

3. Sodium butanoate

4. Sodium methanoate

The balanced chemical equation for the combustion reaction of Butane is :

The numbers of structural isomers of ${\mathrm{C}}_4{\mathrm{H}}_8$ (with one double bond) and ${\mathrm{C}}_5{\mathrm{H}}_8$ (with one triple bond) are:

1. ${\mathrm{C}}_4{\mathrm{H}}_8 = 3 ; {\mathrm{C}}_5{\mathrm{H}}_8 = 3$

2. ${\mathrm{C}}_4{\mathrm{H}}_8 = 4 ; {\mathrm{C}}_5{\mathrm{H}}_8 = 4$

3. ${\text{C}}_4{\mathrm{H}}_8 = 3 ; {\mathrm{C}}_5{\mathrm{H}}_8 = 4$

4.${\mathrm{C}}_4{\mathrm{H}}_8 = 4 ; {\mathrm{C}}_5{\mathrm{H}}_8 = 3$

The IUPAC names of the following compounds are?

(a) CH3CH=C(CH3)2

(b) CH2=CH-C≡C-CH3

(c)

(d)

(e)

(g) CH3 – CH = CH – CH2 – CH = CH – CH – CH2 – CH = CH2

                                                                  |

                                                             C2H5

1.  2-Methylbut-2-ene, Pen-1-ene-3-yne, 1, 3-Butadiene, 4-Phenyl but-1-ene , 2-Methyl phenol, 5-(2-Methylpropyl)-decane and 4-Ethyldeca-1, 5, 8-triene

2. 4-Phenyl but-1-ene, Pen-1-ene-3-yne, 1, 3-Butadiene, 2-Methylbut-2-ene, Pen-1-ene-3-yne, 2-Methyl phenol, 5-(2-Methylpropyl)-decane and 4-Ethyldeca-1, 5, 8-triene

3. 2-Methylbut-2-ene, 4-Phenyl but-1-ene, 1, 3-Butadiene, Pen-1-ene-3-yne, 2-Methyl phenol, 5-(2-Methylpropyl)-decane and 4-Ethyldeca-1, 5, 8-triene

4. 4-Ethyldeca-1, 5, 8-triene, Pen-1-ene-3-yne, 1, 3-Butadiene, 4-Phenyl but-1-ene, 2-Methyl phenol, 5-(2-Methylpropyl)-decane and 2-Methylbut-2-ene

Lewis acid(s) that can be used during the ethylation of benzene is/are:

1. ${\mathrm{FeCl}}_3$

2. ${\mathrm{SnCl}}_4$ 

3. ${\mathrm{BF}}_3$

4. All of the above

Out of benzene, m–dinitrobenzene and toluene, the one that will undergo nitration most easily is -

1. Benzene

2. m–Dinitrobenzene

3. Toluene

4. None of these

Benzene is extraordinarily stable, though it contains three double bonds, because of -

1. Delocalized protons

2. Delocalized neutrons

3. Resonance

4. None of these

Propanal and pentane-3-one are the products of ozonolysis of an alkene. The structural formula of the alkene is  :

1.		2.	,
3.		4.