Fill in the blanks with the choices given in brackets:

(i) Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an example of …………… (dehydration/dehydrogenation/dehydrohalogenation)

(ii) When sodium chloride is heated with concentrated sulphuric acid below 200°C, one of the products formed is …………… (sodium hydrogen sulphate / sodium sulphate / chlorine)

(iii) Ammonia reacts with excess chlorine to form …………… (nitrogen / nitrogen trichloride / ammonium chloride)

(iv) Substitution reactions are characteristic reactions of …………… (alkynes / alkenes / alkanes)

(v) In Period 3, the most metallic element is …………… (sodium / magnesium / aluminium)

(i) Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an example of dehydration

(ii) When sodium chloride is heated with concentrated sulphuric acid below 200°C, one of the products formed is sodium hydrogen sulphate (sodium hydrogen sulphate / sodium sulphate / chlorine)

(iii) Ammonia reacts with excess chlorine to form nitrogen trichloride

(iv) Substitution reactions are characteristic reactions of alkanes

(v) In Period 3, the most metallic element is sodium.