Biomolecules — Chemistry STD 12 Science — Question

Give an example of a material used for making semipermeable membrane for carrying out reverse osmosis.

Explain the fact that in aryl alkyl ethers (i) the alkoxy group activates the benzene ring towards electrophilic substitution and (ii) it directs the incoming substituents to ortho and para positions in benzene ring.

A galvanic cell has electrical potential of 1.1V. If an opposing potential of 1.1V is applied to this cell, what will happen to the cell reaction and current flowing through the cell?

The rate of a reaction becomes four times when the temperature changes from 293 K to 313K. Calculate the energy of activation (E_a) of the reaction assuming that it does not change with temperature.
[R=8.314 J K^-1 MOL^-1, log 4=0.6021]

Accomplish the following conversion:
Aniline to 2, 4, 6 -tribromofluorobenzene.

The rate constant for the decomposition of hydrocarbons is 2.418 × 10^–5s^–1 at 546 K. If the energy of activation is 179.9 kJ/mol, what will be the value of pre-exponential factor.

Write down use of KMnO₄

How do polar solvents help in the first step in S_N1 mechanism?

Answer the following questions.
a-amino acids have relatively higher melting points than the corresponding halo acids. Explain.