Which gaseous compound on treatment with dihydrogen produces methanol?

Glucose on treatment with hydrogen chloride in methanol forms

Which of the following compound on treatment with methanol is potassium methoxide will yield methyl vinyl ether ?

Which compound to use for treatment of tumor?

Which compound to use for treatment of tumor?

Which one of the following nitro compounds when react with nitrous acid followed by treatment with alkali produces blue colour?

A colourless compound X on treatment with alc. KOH gave a gaseous compound Y. The compound Y decolourises bromine water and alkaline KMnO_(4) solution but gives no precipitate with ammoniacal cuprous chloride. The compound X is :

Which of the following produces hydrolith with dihydrogen ?