Complete combustion of methane gives

Only

C O_{2}

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C O_{2}

and

C O

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C O, C O_{2}

and

H_{2} O

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C O_{2} and H_{2} O

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Solution

The correct option is D $C O_{2} and H_{2} O$
Complete combustion carbon and carbon containing fuels in excess of air gives carbon dioxide and water. It is a preparation method of $C O_{2}$
Only in incomplete combustion CO is produced.
Therefore the reaction is,
$C H_{4} + 2 O_{2} (g) Δ ⟶ C O_{2} (g) + 2 H_{2} O (g)$

THEORY
Carbon dioxide:

The C atom undergoes sp hybridisation. Two sp hybridised orbitals of carbon atoms overlap with two p orbitals of oxygen to make two sigma bonds.

Other two electrons are involved in pπ - pπ bonding with an oxygen atom.

Resonating structures of $C O_{2}$ :

It has a linear shape [with both C-O bonds of equal length (115 pm)] with no dipole moment.

Preparation:
1. Prepared by the complete combustion of carbon and carbon-containing fuels in excess of air.
$C H_{4} (g) + 2 O_{2} (g) △ \to C O_{2} (g) + 2 H_{2} O (g)$
$C (s) + O_{2} (g) △ \to C O_{2} (g)$
2. In the laboratory, made by the action of dilute HCl on marble chips $(C a C O_{3})$
$C a C O_{3} (s) + 2 H C l (a q) \to C O_{2} (g) + H_{2} O (l) + C a C l_{2} (a q)$
3. Industrially, produced as a by-product during the manufacture of CaO
$C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$
$C a C O_{3} (s) + 2 H C l (a q) \to C O_{2} (g) + H_{2} O (l) + C a C l_{2} (a q)$

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