Methyl alcohol on oxidation with acidified $K_2Cr_2O_7$ gives

Which of the following will not give the iodoform test?

An organic compound $X$ is oxidised by using acidified $K_{2}Cr_{2}O_{7}$. The product obtained reacts with phenyl hydrazine but does not answer the silver mirror test. The possible structure of $X$ is

Glycerol reacts with conc. $HNO_3$ and conc. $H_2SO_4$ to form

Which one of the following is a secondary alcohol?

What are $X$ and $Y$ in the following reaction? $R-OH + PCl_5 \rightarrow X + Y + HCl$