Isopropyl alcohol on oxidation forms

Which of the following is a secondary alcohol?

Oxidation of allyl alcohol with a peracid gives a compound of molecular formula $C_3H_6O_2$,which contains an asymmetric carbon atom. The structure of the compound is

Identify the product $P$ in the following reaction:
$R-CH(OH)-R \xrightarrow{Cu, 573 \ K} P$

Which of the following gives a negative 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