(a) Give the IUPAC name for the following organic compounds: 
1. Propan-1-ol: The longest chain contains 3 carbon atoms (propane). The functional group is an alcohol (-OH), which gets the suffix "-ol". Since it is attached to the first carbon, it is propan-1-ol.
2. But-1-ene: The parent chain has 4 carbon atoms (but-). The presence of a double bond indicates an alkene (suffix "-ene"). The double bond starts at the first carbon, hence but-1-ene.
Which of the following element pairs will form an ionic bond? 
A hydrocarbon X undergoes the reaction under suitable conditions as shown below. 
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। 