Ncert Solutions Chemistry Class 12th

Biomolecules are organic compounds essential for life; they are found in all living organisms. In chemistry class 12, we talked about the following biomolecules: carbohydrates, proteins, lipids, nucleic acids, enzymes, and vitamins. 

Biomolecules chemistry class 12 connects biology and chemistry and helps us understand metabolism, heredity, and biochemical reactions. 

Nitrogen, sulphur and halogens are tested in an organic compound by lassaigne's test.
The organic compound is fused with sodium metal as to convert these elements into ionisable inorganic substances.
Na + C + N → NaCN
2Na + S → Na? S
2Na + X? → 2NaX
The cyanide, sulphide or halide ions can be confirmed in aqueous solution by usual test.

4-ethoxycarbonylpent-3-enoic acid

In S?2 reaction, inversion takes place, so configuration get reversed.

When Ferric chloride reacts with potassium thiocyanate a blood red colour of Ferric thiocyanate is formed
FeCl? + 3KSCN → Fe (SCN)? + 3KCl

Coordination no. of an atom in BCC is 8.

To stop bleeding, FeCl? is applied locally because FeCl? causes denaturation of proteins present in blood. It is a case of coagulation.

$d=\frac{ZM}{N_A{a}^3}=\frac{4*58.5}{6.02*10^{23}*a^3}$

$43.1=\frac{4*58.5}{6.02*10^{23}*a^3}$

$\therefore a=2.08*10^{-8}cm$

$\therefore r_{N{a}^{+}}+r_{C{l}^{-}}=1.04*10^{-10}$ m