Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 52

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following reagents is used for the separation of acetaldehyde from acetophenone?

A
$$ NH_2OH $$

B
$$ NaOHI_2 $$

C
$$ NaHSO_3 $$

D
$$ C_6H_5NHNH_2 $$

Solution

$$Acetaldehyde (CH_{3}CHO)$$

$$Acetophenone(C_{6}H_{5}C(O)CH_{3})$$

$$A)NH_{2}OH$$ is Hydroxylamine which is a derivative of ammonia which gives nuclear fuse addition reaction with the elimination of water. It reacts with both Acetaldehyde and Acetophenone.

$$B)NaOHI_{2}$$ is a carbon compound test which gives the carbon compound having $$COCH_{3}$$ group. Both Acetaldehyde and Acetophenone has $$COCH_{3}$$ group

$$C)NaHSO_{3}$$ reacts with acetaldehyde to form an addition compound which is precipitated. Acetaldehyde can be recovered with dilute $$HCl$$. Acetophenone does not react.

$$D)C_{6}H_{5}NHNH_{2}$$ is an ammonium derivative known as phenylhydrazine
which gives nuclear fuse addition reaction with the elimination of water. It reacts with both Acetaldehyde and Acetophenone.

$$\mathbf{Hence\ the\ correct\ answer\ is\ option\ (C).}$$
Question 2
1 / -0

Prussian blue colour is obtained by mixing together an aqueous solution of $$ Fe^{3+} $$ salt with:

A
ferricyanide

B
ferrocyanide

C
hydrogen cyanide

D
sodium cyanide

Solution

Potassium ferricyanide reacts with ferrous iron in an acidic solution to produce the insoluble blue pigment, commonly referred to as Turnbull's blue or Prussian blue. To detect ferric $$(Fe^{+3})$$ iron, potassium ferrocyanide is used instead in the Perls' Prussian blue staining method.

$$\mathbf{Hence\ the\ correct\ answer\ is\ option\ (B).}$$
Question 3
1 / -0

The IUPAC name of tertiary butyl iodide is:

A
1-iodo-3-methyl propane

B
2-iodo-2-methyl propane

C
4-iodobutane

D
2-iodobutane

Solution

Correct IUPAC name is
2-iodo-2-methyl propane
Question 4
1 / -0

Which one is not correct for homologous series?

A
All members have a general formula

B
All members have same chemical properties

C
All members have same physical properties

D
All members have same functional group

Solution

A series of organic compounds that have similar structural features but differ from adjacent members by $$-CH_2$$ group is referred to as homologous series. They have same general formula and because of the same functional group, they have similar chemical properties but due to varying mass, they have different physical properties.

Hence the correct option is C.
Question 5
1 / -0

The grouping >CO is present in:

A
ethers

B
alcohols

C
ketones

D
None of these

Solution

Ketones are having $$>C=O$$ group. Ex- $$CH_3-\overset {\overset {\displaystyle O }{||}}C-CH_3$$
Question 6
1 / -0

$$ CH_2 COCI $$ is used to detect the number of amino group in the organic compounds. When a compound of molecular mass 180 is acetylated,gives a compound of molecular mass 390. The number group in the compounds is

A
1

B
5

C
2

D
4

Solution

$$ NH_2 + CH_3 -\overset { \overset { O }{ parallel } }{ C } -CI\rightarrow \underset { \underset { H }{ | } }{ N } -\overset { \overset { O }{ parallel } }{ C } -CH_ 3+HCl $$
Let the amino compound has n$$ (-NH_2) $$ group Molecular mass of the product will be.
$$ 180-n \times 1 + n\times 143 = 390 $$
42n = 210
n = 5 ]
Question 7
1 / -0

The functional groups present in 'salol' are

A
$$-NH_{2}$$ and $$-OR$$

B
$$-OH$$ and $$-COR$$

C
$$-NH_{2}$$ and $$-COOH$$

D
$$-OH$$ and $$-COOR$$

Solution

The functional groups present in 'salol' are "- $$OH$$ and -$$ COOR$$".
Question 8
1 / -0

Which of the following names are correct for the compound?
$${ \left( { CH }_{ 3 } \right) }_{ 2 }CHCN$$

A
2-Methyl propane nitrile

B
Isobutyronitrile

C
Isopropyl cyanide

D
All are correct

Solution

The given compound can be named as 2-Methyl propane nitrile or Isobutyro nitrile or Isopropyl cyanide.
Therefore, option (D) is correct.
Question 9
1 / -0

The chemical name of DDT is

A
Dichloro dinitrotoluene

B
Dichloro dimethyl toluene

C
$$p,p-dichloro$$ diphenyl trichloroethane

D
None of the above

Solution

$$p,p-dichloro$$ diphenyl trichloroethane
Question 10
1 / -0

Number of bonds in $$SO_2$$:

A
Two $$\sigma$$ and two $$\pi$$

B
Two $$\sigma$$ and one $$\pi$$

C
Two $$\sigma$$ and two $$\pi$$ and one lone pair

D
None of these

Solution

Answer is Option C.
The sulphur dioxide molecule contains $$2σ$$, $$2π$$ bonds and one lone pair of electrons. $$S$$ atom contains $$6$$ valence electrons out of which it shares $$2$$ electrons with $$2$$ $$O$$ atoms to form $$2$$ $$sigma$$ bonds.It also shares $$2$$ electrons with $$2$$ $$O$$ atoms to form $$π$$ bonds. The remaining $$2$$ electrons appear as $$one$$ lone pair of electrons. $$SO_2$$ molecule has bent geometry. The $$S$$ atom undergoes $$sp^2$$ hybridization.

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Organic Chemistry Some Basic Principles and Techniques Test - 52

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Organic Chemistry Some Basic Principles and Techniques Test - 52

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SHARING IS CARING

Question 1

$$ NH_2OH $$

$$ NaOHI_2 $$

$$ NaHSO_3 $$

$$ C_6H_5NHNH_2 $$

Solution

Question 2

ferricyanide

ferrocyanide

hydrogen cyanide

sodium cyanide

Solution

Question 3

1-iodo-3-methyl propane

2-iodo-2-methyl propane

4-iodobutane

2-iodobutane

Solution

Question 4

All members have a general formula

All members have same chemical properties

All members have same physical properties

All members have same functional group

Solution

Question 5

ethers

alcohols

ketones

None of these

Solution

Question 6

1

5

2

4

Solution

Question 7

$$-NH_{2}$$ and $$-OR$$

$$-OH$$ and $$-COR$$

$$-NH_{2}$$ and $$-COOH$$

$$-OH$$ and $$-COOR$$

Solution

Question 8

2-Methyl propane nitrile

Isobutyronitrile

Isopropyl cyanide

All are correct

Solution

Question 9

Dichloro dinitrotoluene

Dichloro dimethyl toluene

$$p,p-dichloro$$ diphenyl trichloroethane

None of the above

Solution

Question 10

Two $$\sigma$$ and two $$\pi$$

Two $$\sigma$$ and one $$\pi$$

Two $$\sigma$$ and two $$\pi$$ and one lone pair

None of these

Solution

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