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Hydrocarbons

Short Answer Type

141.

What happens when:

(i) Ethyl alcohol is heated in the presence of Al₂O₃ at 493 K?

(ii) Ethylene dibromide is heated with zinc dust?

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Long Answer Type

142.

Explain the mechanism of the following reaction:

$straight C subscript 2 straight H subscript 5 OH space rightwards arrow from 440 space straight K to Conc. space straight H subscript 2 SO subscript 4 of space CH subscript 2 space equals space CH subscript 2 space plus space straight H subscript 2 straight O$

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143.

How are alkenes prepared from Alkynes ?

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Short Answer Type

144.

The $straight pi$ -bond is weaker than carbon-carbon σ bond. Explain.

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145.
Why are alkenes more reactive than alkanes ?

Alkenes have a carbon-carbon double bond (>C = C<) in their molecules. The >C = C< bond is made up of one strong σ bond and one weak bond. The electrons of the bond are more exposed which increase reactivity. In other words, the presence of bond (formed by the sideways overlapping of atomic orbital) makes alkenes highly reactive chemically as compared to alkanes.