(a) Basicity of HCl: Hydrochloric acid (HCl) is a monobasic acid. It contains only one ionizable hydrogen atom per molecule (HCl H^+ + Cl^-). Acid salts are only formed by polybasic acids (like H_2SO_4) where there is at least one replaceable hydrogen left after partial neutralization. Since HCl has only one hydrogen, it can only form normal salts.
(b) Nuclear Charge: As we move across a period from left to right, the nuclear charge (number of protons) increases while the number of shells remains the same. This increases the force of attraction exerted by the nucleus on the shared pair of electrons, thereby increasing electronegativity.
Which of the following element pairs will form an ionic bond? 
A hydrocarbon X undergoes the reaction under suitable conditions as shown below. 
(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। 