The structure of 4-methylpent-2-en-1-ol is (CH₃)₂CHCH=CHCH₂OH.
It is evident from the IUPAC name that -OH is attached to the first carbon in the chain and the double bond is at the second position.

According to the IUPAC rules, all the three carboxylic acid groups are treated as equal. So, the correct IUPAC name of the above given compound is pentane-1,3,5-tricarboxylic acid.

Propene has three hyperconjugated C-H bonds. The hyperconjugating structures of propene are as follows:

The structure  does not exhibit tautomerism because this structure is extra stable due to the presence of conjugated double bond system.

Only statement (2) is correct.
Stability ∝ Resonance energy

Whereas, statements 1 and 3 are incorrect.
Resonance energy ∝ Number of canonical structures
Resonance energy = (Expected heat of hydrogenation) - (Actual heat of hydrogenation)

I, II, III and IV have 6, 5, 3 and 2 hyperconjugating H-atoms, respectively. The more are the hyperconjugating atoms, the more is the stability.

Soda-lime test is used to detect nitrogen element of organic compound.

These reactions are used for the direct estimation of oxygen in organic compound from the mass of carbon dioxide produced.

∵ M × V (ml) = m mol
number of mili moles of H₂SO₄ = 10
H₂SO₄ + 2NH₃ → (NH₄)₂SO₄
According to the balanced equation:
10 m mol of H₂SO₄ reacts with 20 m mol of NH₃
1 mol NH₃ contains 14 g of nitrogen.
20 × 10^-3 mol NH₃ contains 14 × 20 × 10^-3 g of nitrogen.
Percentage of nitrogen in 0.75 g of the sample = × 100 = 37.33%

A known mass of an organic compound is heated with conc. H₂SO₄ when nitrogen present in the organic compound is quantitatively converted into ammonium sulphate. Ammonium sulphate thus obtained is boiled with conc. NaOH solution. The NH₃ thus liberated is absorbed in a known volume of standard acid solution (HCl or H₂SO₄).