Question

Which of the following occurs easily in ethylene
A. Addition
B. Substitution
C. Elimination
D. Rearrangement

Answer 1

Hint: In this question we have to use the concept of all the types of reactions, namely: addition, substitution, elimination and rearrangement to get to know which will occur easily in ethylene. Ethylene is also known as ethene and has a double bond between two carbon atoms.

Complete Step by Step Answer:
Only chemical compounds with multiple bonds—such as molecules with carbon-carbon double bonds (alkenes), carbon-carbon triple bonds (alkynes), or molecules with carbonyl (C=O) groups—can undergo addition reactions.

One functional group in a chemical molecule is replaced by another functional group during a chemical reaction known as a substitution reaction, sometimes referred to as a single displacement reaction or single replacement reaction. A good illustration of a substitution reaction is halogenation.
A pair of atoms or groups of atoms are removed from a molecule through an elimination reaction, which typically involves the use of acids, bases, metals, and in certain cases, high temperatures.

A rearrangement reaction is a broad category of chemical processes in which the carbon skeleton of a starting molecule is changed to produce an isomer with a different structural composition. In the same molecule, a substituent frequently moves from one atom to another.
Therefore, an additional reaction will occur easily in ethylene.
The correct answer is A.

Additional Information: The hydrocarbon ethylene, also known as ethene by the IUPAC, has the formula C₂H₄ or CH₂=CH₂. When pure, it is a colourless, combustible gas with a tinny "sweet and musky" smell. It is the simplest alkene (a hydrocarbon with carbon-carbon double bonds) (a hydrocarbon with carbon-carbon double bonds). Natural sources of ethylene include both natural gas and petroleum; it is also a naturally occurring hormone in plants, in which it restricts growth and promotes leaf fall, and in fruits, in which it stimulates ripening.

Note: C₂H₄ will give an additional reaction because they are connected by double or triple bonds and are unsaturated hydrocarbons. An additional reaction occurs when two molecules combine to form a single, larger molecule. In the process, nothing is lost. The larger one has every atom from the original molecules. An addition reaction is an electrophilic addition process.