Which of the following amino acids would be easiest to distinguish from the other three in a titration? A. F - Phenylalanine.
B. K - Lysine.
C. V - Valine.
D. G - Glycine.

B. K - Lysine.

Explanation:

Required

The easiest amino acid to distinguish

The 4 amino acids in the question can be grouped into 2. The groups are:

(1) Group I - Nonpolar amino acids and (2) Group IV - Basic amino acids

Three of the amino acids belong to group I while the last belongs to group IV.

The acids according to their categories are:

(1) Group I - Nonpolar amino acids:- Phenylalanine, Valine and Glycine

(2) Group IV - Basic amino acids:- Lysine

Because Lysine belongs to a different group different from the other three, it will be easily distinguished because it will exhibit a different property from the other three acids.

here we have to get the change of moles on decrease the volume of the reaction in gas phase.

the   per the given options it will decrease by (d) 11-50%

we know, on decreasing the volume of the gas phase reaction the reaction moves to the product side.

the reaction:                     so₂cl₂ (g) = so₂ (g) + cl₂ (g)         total

the moles at equilibrium:   1 - α                 α               α           = 1+α

concentrations:                   1 - α               α               α           = 1 + α

(concentration = moles/volume, as volume is 1 l)

(where α is the degree of dissociation)

now the dissociation constant in terms of concentration is :

=  

or,

or,   = (at v = 1l)

the reaction:                     so₂cl₂ (g) = so₂ (g) + cl₂ (g)         total

the moles at equilibrium:   1 - α                 α               α           = 1+α

concentrations:               (1 - α)/0.5           α/0.5         α/0.5       = (1 + α)/0.5

thus, the dissociation constant in terms of concentration is :

or,  

=  

so, the change of 1 : 1/0.5

or, 1: 2

thus it will decrease by 50%.

or, as per the given options it will decrease by 11-50%

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