A hydrocarbon X undergoes the reaction under suitable conditions as shown below. 
Step 1: Understanding the Reaction (Cracking):
The reaction described is thermal cracking, where a long-chain saturated hydrocarbon (alkane) is broken down into a smaller alkane and an unsaturated hydrocarbon (alkene).
Step 2: Identifying the Compounds:
X (Butane): (C_4H_10). This is an alkane. All carbon-carbon bonds are single bonds (Saturated). Y (Propene): (C_3H_6). This is an alkene. It contains at least one carbon-carbon double bond (Unsaturated). Z (Methane): (CH_4). This is the simplest alkane (Saturated).
Step 3: Defining Unsaturated:
Unsaturated hydrocarbons are those that contain double or triple covalent bonds between carbon atoms. In this reaction, only propene (Y) fits this definition.
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Step 4: Final Answer:
Compound Y only is unsaturated.
Which of the following element pairs will form an ionic bond? 
(a) Give the IUPAC name for the following organic compounds: 
नीचे दिए गए चित्र को ध्यान से देखिए और चित्र को आधार बनाकर कोई लेख, घटना अथवा कहानी लिखिए जिसका सीधा व स्पष्ट संबंध चित्र से होना चाहिए। 