The possible stereo-structures of CH₃CHOHCOOH, which are optically active, are called

In which of the following compounds, the C$$-$$Cl bond ionisation shall give most stable carbonium ion?

In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is

Consider the following compounds :

Hyperconjunction occurs in