Which is more stable ,vinyl carbocation or allyl carbocation?

The short answer is Allyl carbonation is more stable than Vinyl carbocation bacuse Allyl carbocation is resonance stabilised where as in case of vinyl carbocation, the positive charge on sp hybridized  carbon, which is highly unstable.

Air contains 20℅ O2 by Volume.How many cc of air will required for oxidation of 100 cc of acetylene?

0.0833 moles of a carbohydrate having empirical formula of CH2O contains one gram hydrogen, find molecular formula

Given EF= CH2O then mass=30

And carbohydrate(CH2O) contains 1gram hydrogen:

From EF it is obvious that 2 grams hydrogen present in 30 grams then 1grams hydrogen present in 15 grams corbohydrate.

Number of moles = Given mass/M.Mass

                              0.0833  =15/M.mass

Then M.mass=180

We Must needed 

Molecular Formula(MF) = n× Empirical Formula (EF)

MF=6(CH2O) = C6H12O6

Where n = Molecular mass/Empirical mass

             n= 180/30=6

Which carbocation is more stable : Benzyl or Tertiary?

Some time it is dilemma tertiary is more stable than Benzylic or benzylic is more stable than tertiary carbocation.

But their is two case (1) Primary benzylic carbonation is less stable than 3° carbocation because the tertiary carbocation is stablized due to +I effect and +H effect, while benzylic carbocation stabilised by +R effect only thus tertiary become more stable than primary Benzylic . 

In (2) case of secondary and tertiary benzylic carbocation become more stable than tertiary because now +H effect also operates along with +R effect.

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What is the Raoult's law and it's application ?

RAOULT'S LAW:

(1) Vapour pressure of a number of binary solutions of volatile liquids such as benzene and toluene at constant temperature gave the following generalization which is known as the Raoult's law.

(2) Raoult's law states that "The partial pressure of any volatile component of a solution at any temperature is equal to the vapour pressure of the pure component multiplied by the mole fraction of that component in the solution

(A) Vapour pressure of liquid-liquid Solution:

(3) Suppose a binary solution contains n_A moles of a volatile liquid A and n_B moles of a volatile liquid B, if P_Aand P_B are partial pressure of the two liquid components, the according to Raoult's law

(4) If the vapour behaves like an ideal gas, thenaccording to Dalton's law of partial pressures, the total pressure P is given by 

Graphical representation of Raoult's law:

(5) The relationship between vapour pressure and mole fraction of an ideal solution at constant temperature is shown. The dashed lines 1 and 2 represent the partial pressure of the components. The total vapour pressure is given by 3^rd line in the above figure.

(B) Vapour pressure of Solid-liquid Solution:

(1) Vapor pressure, when a small amount of a non-volatile solute (solid) is added to the liquid (solvent). It is found that the vapour pressure of the solution is less than that of the pure solvent.

(2) The lowering of vapour pressure is due to the fact that the solute particles occupy a certain surface area and evaporation takes place from the surface only. and

(3) The particles of the solvent will have a less tendency to change into vapour i.e. the vapour pressure of the solution will be less than that of the pure solvent and it is termed as lowering of vapour pressure.

For a solution of non-volatile solute with volatile solvent.