A molecule ‘X’ contains ${sp}^{2}$ hybridised carbon atoms as well as five sigma bonds in it. Identify ‘X’.

Ethane

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Acetylene

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Ethylene

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Propane

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Solution

The correct option is C Ethylene
$∙$ In ethylene $(C H_{2} = C H_{2})$ molecule, a double bond is formed between two ${sp}^{2}$ hybridized carbon atoms.

$∙$ Each carbon atom in ethane $(C H_{3} - C H_{3})$ and propane $(C H_{3} - C H_{2} - C H_{3})$ is ${sp}^{3}$ hybridised.

$∙$ An acetylene molecule $(C H \equiv C H)$ contains two sp hybridised carbon atoms with a triple bond between them.

The given table shows the molecular formula and total number of sigma bonds present in the compound.
$\begin{matrix} C o m p o u n d & M o l e c u l a r F o r m u l a & N o . o f s i g m a b o n d s E t h a n e & C H_{3} - C H_{3} & 7 A c e t y l e n e & C H \equiv C H & 3 E t h y l e n e & C H_{2} = C H_{2} & 5 P r o p a n e & C H_{3} - C H_{2} - C H_{3} & 10 \end{matrix}$ Hence, the compound 'X' is ethylene as it has two $s p^{2}$ hybridised carbon atoms as well as five sigma bonds.

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Q. Assertion :Acetylene is 1-alkyne. Reason: Acetylene is unsaturated hydrocarbon with

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Q. Which bonds are formed by a carbon atom with

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A molecule ‘X’ contains sp2 hybridised carbon atoms as well as five sigma bonds in it. Identify ‘X’.

A molecule ‘X’ contains ${sp}^{2}$ hybridised carbon atoms as well as five sigma bonds in it. Identify ‘X’.