21.

If a LPG cylinder contains mixture of butane and isobutane, then the amount of oxygen that would be required for combustion of 1 kg of it will be

• 2.50 × 10³ gm

• 4.50 × 10³ gm

• 180  × 10³ gm

• 3.58 × 10³ gm

The correct order of basic strength of the following are

• 1 > 2 > 3 > 4

• 4 > 2 > 3 > 1

• 3 > 4 > 2 > 1

• 3 > 2 > 4 > 1

An organic compound C₃H₅Cl (A) when treated with magnesium in dry ether gives (B) which on treating with CO₂ followed by acid hydrolysis gives C₄H₆O₂ (C). (C) is also obtained on oxidation of a hydrocarbon (D) C₈H₁₂. Structure of A is

• CH₂=CH-CH₂-Cl

• CH₂=C(Cl)-CH₃

• CH(Cl)=CH-CH₃

• 

Oxidation number of chlorine atom in Ca(OCl)Cl is

• -1

• +1, -1

• 0

• -1, 0

The cumulated alkadiene is

Which of the following compound is not aromatic?

• 1, 3-cyclobutadene

• Pyridine

• Furan

• Thiophene

The structure shows

• geometrical isomerism

• optical isomerism

• geometrical and optical isomerism

• tautomerism

What is the correct IUPAC name of

• 4-methoxy-2-nitrobenzaldehyde

• 4-formyl-3-nitroanisole

• 4-methoxy-6-nitrobenzaldehyde

• 2-formyl-5-methoxynitrobenzene

In Kjeldahl's method of estimation of nitrogen, CuSO₄ act as

• oxidising agent

• reducing agent

• catalytic agent

• hydrolysis agent

The pairs of compounds which cannot exists together in a solution is

• NaHCO₃ and NaOH

• Na₂CO₃ and NaOH

• Na₂CO₃ and NaHCO₃

• NaHCO₃ and NaCl