The product $(C)$ of the reaction is:

Which of the following compounds gives a positive Baeyer's test but does not form a white precipitate with ammoniacal silver nitrate solution?

The product $(B)$ is:

Arrange the compounds $I$,$II$,and $III$ in decreasing order of their heats of combustion.

What are $X$ and $Y$ respectively in the following sets of reactions?
$I. \ CH_3CH_2CH_2OH \xrightarrow{PBr_3} X$
$II. \ CH_3CH=CH_2 \xrightarrow{HBr, (C_6H_5COO)_2} Y \text{ (major)}$

Which of the following substituted benzene derivatives would furnish three isomers in significant amount when one more substituent is introduced: