Question

A compound P on heating with excess sulphuric acid forms another compound Q which on addition of hydrogen in presence of nickel catalyst forms a saturated compound R. One molecule of R on combustion gives two molecules of carbon dioxide and there molecules of water. Identify P, Q ,R . Also wrote the chemical reactions involved.​

Answer 1

Answer:

Ethanol dehydration I'n presence of H2SO4

Forms Ethene

Ethene Reaction with H2/Ni give ethane

ethane combustion give 2 mole of Co2

I write Reaction Here

CH3-CH2-OH - CH2=CH2

CH2=CH2 H2/Ni. CH3-CH3

C2H6 + 3O2 - 2CO2 + 2H2O

Answer 2

Explanation

$\huge{\fbox{\fbox{\bigstar{\mathfrak{\red{hello}}}}}}$

The compound 'P' is Ethanol. When it is heated with concentrated sulphuric acid, it gets dehydrated and forms Ethene. So, the compound 'Q' is Ethene.

$ch {3}ch2oh \: \: \: gives \: \: c2h4 + h2o$

(Q) When Hydrogen is added to Ethane, in presence of Ni catalyst. it forms an unsaturated hydrocarbon i.e. Ethane. So, the compound 'R' is Ethane.

$c2h4 \: + oh \: \: gives \: \: c2h6$

(R) On combustion reaction of ethane, the products formed are:

$c2h6 + \frac{7}{2}o2 \: \: gives \: \: 2co2 + 3h2o$