The number 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) is:
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. \(\mathrm{C}_4 \mathrm{H}_8=3 ; \mathrm{C}_5 \mathrm{H}_8=4\)
4. \(\mathrm{C}_4 \mathrm{H}_8=4 ; \mathrm{C}_5 \mathrm{H}_8=3\)

Which of the following is the correct balanced chemical equation for the combustion of butane?

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

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

Match Column I, which contains structures, with Column II, which contains IUPAC names, and choose the correct option.

(a)

(b)

(c)

(d) 

Column II 

 P . 1, 3-Butadiene,
 Q .4-Phenyl but-1-ene 
 R . 2-Methyl phenol,
 S. 5-(2-Methylpropyl)-decane
  Options

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

Which of the following will undergo nitration most easily: benzene, m-dinitrobenzene, or toluene?

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

1. Delocalized protons

2. Delocalized neutrons

3. Resonance

4. None of the above.

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

1.		2.	,
3.		4.