Which one of the following reactions is a method for the conversion of a ketone into a hydrocarbon?

An optically active alkyl halide $C_4H_9Br$ $[A]$ reacts with hot $KOH$ dissolved in ethanol and forms alkene $[B]$ as the major product,which reacts with bromine to give dibromide $[C].$ The compound $[C]$ is converted into a gas $[D]$ upon reacting with alcoholic $NaNH_2.$ During hydration,$18 \ g$ of water is added to $1 \ mole$ of gas $[D]$ on warming with mercuric sulphate and dilute acid at $333 \ K$ to form compound $[E].$ The $IUPAC$ name of compound $[E]$ is $:$

How can propan$-2-$one be converted to tertiary butyl alcohol?

Which of the following cannot give a yellow $ppt.$ with $I_2/NaOH$?

In the following reaction,'$A$' is

The reaction in which $NaCN/C_2H_5OH/HOH$ is used is: