Chemistry Test 153

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Chemistry Test 153

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Weekly Quiz Competition

Question 1
4 / -1

The face centered cubic cell of platinum has a length of 0.392 nm. Calculate the density of platinum (g/cm³) :

(Atomic weight : Pt = 195)

A
2.09

B
30.6

C
7.9

D
21.5

Solution
Question 2
4 / -1

A weak acid of dissociation constant 10^–5 is being titrated with aqueous NaOH solution. The pH at the point of one-third neutralization of the acid will be :-

A
5 + log 2 – log 3

B
5 – log 2

C
5 – log 3

D
5 – log 6

Solution
Question 3
4 / -1

Conductivity of an aqueous solution of 0.1 M HX (a weak mono-protic acid) is 5 × 10^–4 Sm^–1.

Find pK_a[HX].

A
8

B
9

C
10

D
11

Solution
Question 4
4 / -1

Identify best reagent sequence for above conversion ?

A
(i) Ni / H₂ ; (ii) Br₂ / CCl₄

B
(i) Na / Liq. NH₃ ; (ii) Br₂ / CCl₄

C
Br₂ / CCl₄ (excess)

D
HBr / CCl₄ (excess)
Question 5
4 / -1

The products (A) and (B) are :-

A

B

C

D
Question 6
4 / -1

The absolute configuration of the below figure is :-

A
2R, 3S

B
3R, 4S

C
2S, 3R

D
3S, 4R

Solution

The absolute configuration of the below figure is :

Least proirity group always takes at inward the plane.

By even exchange between the groups about chiral carbon then configuration remains same.

Locant number of chiral carbon decided by IUPAC rule.
Question 7
4 / -1

Directions For Questions

Consider the following nucleophiles

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when attached to sp³-hybridized carbon, their leaving group ability in nucleophilic substitution reactions decreases in the order :-

A
I > II > III > IV

B
I > II > IV > III

C
IV > I > II > III

D
IV > III > II > I

Solution

Leaving group ability ∝ Acid strength of conjugated acid
Question 8
4 / -1

The decreasing order of basic characters of the following is :-

A
III > I > IV > II

B
II > I > IV > II

C
IV > III > II > I

D
I > II > III > IV

Solution
Question 9
4 / -1

Structure of B will be :

A

B

C

D

Solution

By using NaBH₄ reduction of only aldehyde group takes place.
Question 10
4 / -1

The correct statement about the following disaccharide is :

A
Ring (I) is pyranose with α-glycosidic link

B
Ring (I) is furanose with α-glycosidic link

C
Ring (II) is furanose with α-glycosidic link

D
Ring (II) is pyranose with β-glycosidic link

Solution

Ring (I) contain 5 carbon and 1 oxygen atom.

It is pyranose structure.

–OH group present in down site define as a isomer, involve in formation of glycosidic link.