Which of the following compounds will evolve hydrogen on treatment with metal?

Ethanol and phenol cannot be distinguished by

Diols $(I-IV)$ which react with $CrO_3$ in aqueous $H_2SO_4$ and yield products that readily undergo decarboxylation on heating,are

In the given reaction sequence,identify the correct reagents to prepare $A$ from $B$. The starting material is benzenesulfonic acid. The reaction with $\Delta / H_3O^+$ yields $B$ (benzene),and the reaction with $1. \text{Fused } NaOH, 2. H^+$ yields $A$ (phenol). Therefore,to prepare $A$ (phenol) from $B$ (benzene),the correct sequence of reagents is:

Match the items given in column $-I$ with the items given in column $-II$.

column $-I$	column $-II$
$(A)$ Antifreeze used in car engine	$(1)$ Neutral $FeCl_3$
$(B)$ Solvent used in perfumes	$(2)$ Glycerol
$(C)$ Starting material for picric acid	$(3)$ Methanol
$(D)$ Wood spirit	$(4)$ Phenol
$(E)$ Reagent used for detection of phenolic group	$(5)$ Ethylene glycol
$(F)$ By-product of soap industry used in cosmetics	$(6)$ Ethanol

Consider the following two reactions $A$ and $B$.
Numerical value of [molar mass of $x$ + molar mass of $y$] is . . . . . . .