The number of possible structural isomers for the compound $C_2H_3Cl_2Br$ is:

Which of the following pairs of compounds exhibits metamerism?

Ethyl acetoacetate shows which type of isomerism?

Which of the following compounds has one of its stereoisomers as a meso compound?

Which of the following compounds contains a pseudo-asymmetric carbon atom?

The starting material is propene $(CH_3-CH=CH_2)$. The reaction with $H_3O^+$ (acid-catalyzed hydration) follows Markovnikov's rule to give $A$ (propan$-2-$ol,$CH_3-CH(OH)-CH_3$). The reaction with $(i) BH_3/THF$ followed by $(ii) H_2O_2/OH^-$ (hydroboration-oxidation) follows anti-Markovnikov's rule to give $B$ (propan$-1-$ol,$CH_3-CH_2-CH_2OH$). What is the relationship between products $A$ and $B$?