Draw the major product formed when HBr reacts with the given epoxide. A 5 carbon ring is fused to an epoxide through a carbon. The other epoxide carbon has a methyl substituent. This reacts with H B r to give the product.

Sorry i dont understand the question can you rephase it?

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts

The answer is nitrogen-containing bases