Pyridinium chlorochromate (PCC) is a mild oxidising agent. It can easily convert primary alcohols into aldehydes.

While others are strong oxidising agents that convert alcohols into carboxylic acid.

CₓHᵧ + (x + y / 4)O₂ → xCO₂ + y / 2 H₂O

Volume of CₓHᵧ = 15 mL

Volume of O₂ = (20 / 100) × 375 = 75 mL

Final volume = Volume of unreacted air + volume of carbon dioxide formed.

Therefore, volume of carbon dioxide formed = 345 - 300 = 45 mL.

According to Avogadro's law, volume ratio = molar ratio.

Hence, x = 3

number of moles of oxygen / number of moles of the hydrocarbon = 5 / 1

x + y / 4 = 5

3 + y / 4 = 5

y = 8

Hence the hydrocarbon is propane (C₃H₈).

Phenelzine is not an antacid; it is an anti-depressant.

According to the situation given in question, reactions are as follows:

For Cr³⁺, E° (Cr³⁺/Cr₂O₇²⁻) = -1.33 V

For Cl⁻, E° (Cl⁻/Cl₂) = -1.36 V

For Cr, E° (Cr/Cr³⁺) = 0.74 V

For Mn²⁺, E° (Mn²⁺/MnO₄⁻) = -1.51 V

Positive E° is for Cr, hence it is the strongest reducing agent.

Contact lenses are made using the polymer Polymethyl Methacrylate which is generally known as PMMA. The lenses made using PMMA are known as hard lenses and were used commonly when first made. Now soft lenses made of polyacrylamide polymer are preferred more than hard lenses.

The alcohol that would react fastest with conc. HCl and anhydrous ZnCI₂ is 2- methylpropan - 2- ol. It is a tertiary alcohol. A mixture of conc. HCl and anhydrous ZnCI₂ is called Lucas reagent.

Primary alcohols react with Lucas reagent very slowly on heating to give alkyl chlorides. Secondary alcohols react with Lucas reagent much faster. Tertiary alcohols instantaneously react with HCl at room temperature.

Note: Lucas reagent is required for primary and secondary alcohol only.

α−D(+)-glucopyranose and β−D(+) -glucopyranose are anomers (a pair of stereoisomers that differ in a configuration only around the first carbon atom i.e. anomeric carbon).

The Kjeldahl method is not applicable to compounds containing nitrogen in nitro and azo groups and nitrogen present in rings (e.g. pyridine, quinoline, isoquinoline) as nitrogen of these compounds does not convert to ammonium sulphate under the conditions of this method.

ΔH = E_a(f) − E_a(b)

= (25 − 35)kJ mol⁻¹

= −10 kJ mol⁻¹