Unsaturated hydrocarbons undergo:

a substitution reaction

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an oxidation reaction

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an addition reaction

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none of the above

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Solution

The correct option is D an addition reaction
Unsaturated hydrocarbons contain either double or triple bonds, which are reactive, so they break easily and convert into single covalent bonds, hence they easily undergo addition reactions.
Example of addition reaction is:
$C H_{2} = C H_{2} + H_{2} N i - c a t a l y s t - ------ \to C H_{3} - C H_{3}$

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Similar questions

Q. Assertion :Unsaturated hydrocarbons decolorize the red coloured bromine water. Reason: Unsaturated hydrocarbon undergoes substitution reaction with bromine water.

Q. Choose the correct answer from the options given below:
(i) The number of C−H bonds in ethane molecule are:
(a) Four
(b) Six
(c) Eight
(d) Ten

(ii) The functional group present in acetic acid is:
(a) Ketonic (>C=O)
(b) Hydroxyl (− OH)
(c) Aldehydic (− CHO)
(d) Carboxyl (− COOH)

(iii) The unsaturated hydrocarbons undergo:
(a) a substitution reaction
(b) an oxidation reaction
(c) an addition reaction
(d) none of the above

Q. Fill in the blanks with the correct words from the brackets:
Alkenes are the (i) ........... (analogous/homologous) series of (ii) ............ (saturated/unsaturated) hydrocarbons. They differ from alkanes due to the presence of (iii) ......... (double/single) bonds. Alkenes mainly undergo (iv) .......... (addition/substitution) reactions.

Fill in the blanks with the correct words from the brackets :

Alkenes are the (a) ...... (analogous/homologous) series of (b) ... (saturated/unsaturated) hydrocarbons. They differ from alkanes due to the presence of (c) .... (double/single) bonds. Alkenes mainly undergo (d) (addition/ substitution) reactions.

In addition reaction, an unsaturated hydrocarbon is converted to saturated hydrocarbon by the addition of hydrogen.

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