Which of the following substances releases hydrogen gas upon reacting with $Na$ metal?

Which of the following reactions will yield $2-propanol$? Select the correct answer from $a, b, c$ and $d$.
$I. \, CH_2 = CH - CH_3 + H_2O \xrightarrow{H^+} $
$II. \, CH_3 - CHO \xrightarrow[(ii) \, H_2O]{(i) \, CH_3MgI} $
$III. \, CH_2O \xrightarrow[(ii) \, H_2O]{(i) \, C_2H_5MgI} $
$IV. \, CH_2 = CH - CH_3 \xrightarrow{KMnO_4} $

Identify the reaction schemes $A, B, C$ for the conversion of vinylcyclohexane to the respective alcohols,given the following methods:
$I-$ Acid-catalyzed hydration
$II-$ Hydroboration-oxidation $(HBO)$
$III-$ Oxymercuration-demercuration

In the above reaction,the molecular formula of glycerol increases by:

Ethanol and phenol cannot be distinguished by

$A$ new carbon-carbon bond formation is possible in