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

1.	\(\mathrm{2 {C}_4 {H}_{10({g})}+13 {O}_{2({g})} \rightarrow 8 {CO}_{2({g})}+10 {H}_2 {O}} + Heat \)
2.	\(\mathrm{2 {C}_4 {H}_{10({g})}+13 {O}_{2({g})} \rightarrow 9 {CO}_{2({g})}+10 {H}_2 {O}+} Heat \)
3.	\(\mathrm{2 {C}_4 {H}_{10({g})}+14 {O}_{2({g})} \rightarrow 8 {CO}_{({g})}+10 {H}_2 {O}}+ Heat \)
4.	\( \mathrm{{C}_4 {H}_{10({g})}+13 {O}_{2({g})} \rightarrow 8 {CO}_{({g})}+10 {H}_2 {O}}+ Heat\)

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

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

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

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.

An alkene ‘A’ contains 3 C – Cσ bonds, 8 C – H σ bonds, and 1 C – C π bond,

 ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass 44 u. The IUPAC name of ‘A’ is:

 An alkene ‘A’ on ozonolysis gives a mixture of ethanal and pentan-3-one.
The IUPAC name of ‘A’ is :

1. 3-Ethylpent-2-ene

2. 3-Ethylpent-2- yne

3. 2-Ethylpent-3-ene

4. 3-Ethylpent-4-yne

The products of ozonolysis of 1,2-dimethyl benzene (o-xylene) are:

1. Methylglyoxal, 1, 2-dimethylglyoxal, and glyoxal

2. Methylglyoxal, 1, 3-dimethylglyoxal, and glyoxal

3. Methylglyoxal, 1, 4-dimethylglyoxal, and glyoxal

4. Methylglyoxal, 1, 5-dimethylglyoxal, and glyoxal

The correct order of decreasing reactivity of the following compounds:

Chlorobenzene, 2,4-Dinitrochlorobenzene, and p-Nitrochlorobenzene

with an electrophile (E⁺)  is :