Given below are two statements :

Statement I : Ethyl pent-4-yn-oate on reaction with CH₃MgBr gives a 3$$^\circ$$-alcohol.

Statement II : In this reaction one mole of ethyl pent-4-yn-oate utilizes two moles of CH₃MgBr.

In the light of the above statements, choose the most appropriate answer from the options given below :

In stratosphere most of the ozone formation is assisted by :

The compound/s which will show significant intermolecular H-bonding is/are :

Which one of the following chemicals is responsible for the production of HCl in the stomach leading to irritation and pain?