The reaction of $Q$ with $PhSNa$ yields an organic compound (major product) that gives a positive Carius test on treatment with $Na_2O_2$ followed by the addition of $BaCl_2$. The correct option$(s)$ for $Q$ is (are):

$0.5 \ g$ of an organic compound containing phosphorus was heated with conc. $HNO_3$ in a Carius tube. The phosphoric acid thus formed was precipitated with magnesia mixture $[MgNH_4PO_4]$,which on ignition gave a residue of $1.0 \ g$ of magnesium pyrophosphate $(Mg_2P_2O_7)$. The percentage of phosphorus in the organic compound is:

$x \ mg$ of an organic compound was analysed by the Kjeldahl method. The ammonia evolved was absorbed in $50 \ mL$ of $0.5 \ M \ H_2SO_4$. The unused acid required $60 \ mL$ of $0.5 \ M \ NaOH$ solution for complete neutralization. If the percentage of nitrogen in the compound is $56$,the value of $x$ is:

Which of the following is a $FALSE$ statement?

When $1 \ g$ of compound $(X)$ is subjected to Kjeldahl's method for the estimation of nitrogen,$15 \ mL$ of $1 \ M$ $H_2SO_4$ was neutralized by the ammonia evolved. The percentage of nitrogen in compound $(X)$ is:

Nitrogen present in an unknown organic compound was estimated by the Dumas method to be $17.7 \%$ by weight. The compound is very likely to be ....