Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is wrong for a homologous series?

A
All members have a same general formula

B
All members have the same functional group

C
All members have the same chemical properties

D
All members have the same physical properties

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 a same functional group, they have similar chemical properties but due to varying mass, they have different physical properties.

Option D is correct.
Question 2
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The functional group in methanol and methanal respectively are :

A
-OH, -CHO

B
-CHO, -OH

C
-OH, -COOH

D
-CHO, -COOH

Solution

In general, an alcoholic functional group is represented by attaching a suffix 'ol' at the end of the name and in case of aldehyde group that is -CHO, it is represented by attaching 'al' at the end of the name. Given names have methanol and methanal. Hence, option A is the correct answer.
Question 3
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Purity of organic liquid can be checked by its characteristic :

A
boiling point

B
volume

C
solubility in water

D
solubility in alcohol

Solution

The purity of a compound may be checked by determining its melting or boiling point.

The technique for determination of melting and boiling points will also be described in this unit. Pure solid and liquid compounds possess sharp melting and boiling points.

Therefore, melting and boiling points of a compound can be used as a criteria of purity.

Option A is correct.
Question 4
1 / -0

The number of carbon atoms in the principal chain of the given compound are :

A
$$7$$

B
$$5$$

C
$$4$$

D
$$6$$

Solution

The number of carbon atoms in the principal chain of the given compound is five because the aldehyde group (here act as a substituent) and double bond has to be given the lowest number. Therefore, the numbering will start from the COOH group and ends in $$CH_3$$ which will include a $$CHO$$ group also.
Question 5
1 / -0

Westrosol is also known as :

A
ethylene dichloride

B
acetylene tetrachloride

C
acetylene tricholoride

D
none of the above

Solution

Westrosol is trichloroethylene. It is also known as acetylene trichloride.
$$\underset {Westron}{CHCl_2CHCl_2} \xrightarrow {Ca(OH)_2} \underset {Westrosol}{CHCl=CCl_2}$$
Question 6
1 / -0

Column-A Column-B Column-C
(1) Alcohol
(2) Aldehyde
(3) Ketone
(4) Carboxylic acid (a) $$-CO-$$
(b) $$-COOH$$
(c) $$-CHO$$
(d) $$-OH$$ (i) Propanal
(ii) Propanone
(iii) Propanol
(iv) Propanoic acid
Direction : Match the functional group with their formulae and examples.
Column-A     Column-B     Column-C
    (1) _______ _______
    (2)               _______         _______
    (3)               _______         _______
    (4)               _______         _______

A
(1) - (d) (iii) ; (2) - (c) (i) ; (3) (b) (ii) ; (4) - (a) (iv)

B
(1) - (d) (iii) ; (2) - (c) (i) ; (3) (a) (ii) ; (4) - (b) (iv)

C
(1) - (d) (iii) ; (2) - (b) (ii) ; (3) (c) (i) ; (4) - (a) (iv)

D
(1) - (d) (iii) ; (2) - (a) (i) ; (3) (a) (iv) ; (4) - (c) (ii)

Solution

1) Alcohol- $$-OH$$ Propanol
2) Aldehyde $$-CHO$$ Propanal
3) Ketone $$-CO-$$ Propanone
4) Carboxylic acid $$-COOH$$ Propanoic acid
Question 7
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The number of $$\pi $$ and $$\sigma $$ bond in the following structure respectively are:

A
$$8, 5$$

B
$$8, 6$$

C
$$3, 8$$

D
$$5, 13$$

Solution

Clearly it has 5 $$\pi $$ and 13 $$\sigma $$.
Question 8
1 / -0

Butanone is a four-carbon compound. The functional group present is:

A
carboxylic acid

B
aldehyde

C
ketone

D
alcohol

Solution

The suffix -one is used for a ketone functional group. Therefore, the functional group in butanone is a ketone.
Question 9
1 / -0

Which of the following is gem-dihalide :

A

B

C

D

Solution

Gem dihalides have halogens attached to the same carbon atom. For e.g.- $$CH_3-C(Cl_2)-CH_3$$
Question 10
1 / -0

The IUPAC name of $$CH_3-C(CH_3)(OH)CH_2-CH(CH_3)CH_3$$ is :

A
$$2,4$$-Dimethylpentan$$-2-$$ol

B
$$2,4$$-Dimethylpentan$$-4-$$ol

C
$$2,2$$-Dimethylbutane

D
Butanol$$-2-$$one

Solution

2,4-Dimethylpentan2ol

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Re-Attempt Weekly Quiz Competition

Column-A	Column-B	Column-C
(1) Alcohol (2) Aldehyde (3) Ketone (4) Carboxylic acid	(a) $$-CO-$$ (b) $$-COOH$$ (c) $$-CHO$$ (d) $$-OH$$	(i) Propanal (ii) Propanone (iii) Propanol (iv) Propanoic acid

Organic Chemistry Some Basic Principles and Techniques Test - 20

Result

Organic Chemistry Some Basic Principles and Techniques Test - 20

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SHARING IS CARING

Question 1

All members have a same general formula

All members have the same functional group

All members have the same chemical properties

All members have the same physical properties

Solution

Question 2

-OH, -CHO

-CHO, -OH

-OH, -COOH

-CHO, -COOH

Solution

Question 3

boiling point

volume

solubility in water

solubility in alcohol

Solution

Question 4

$$7$$

$$5$$

$$4$$

$$6$$

Solution

Question 5

ethylene dichloride

acetylene tetrachloride

acetylene tricholoride

none of the above

Solution

Question 6

(1) - (d) (iii) ; (2) - (c) (i) ; (3) (b) (ii) ; (4) - (a) (iv)

(1) - (d) (iii) ; (2) - (c) (i) ; (3) (a) (ii) ; (4) - (b) (iv)

(1) - (d) (iii) ; (2) - (b) (ii) ; (3) (c) (i) ; (4) - (a) (iv)

(1) - (d) (iii) ; (2) - (a) (i) ; (3) (a) (iv) ; (4) - (c) (ii)

Solution

Question 7

$$8, 5$$

$$8, 6$$

$$3, 8$$

$$5, 13$$

Solution

Question 8

carboxylic acid

aldehyde

ketone

alcohol

Solution

Question 9

Solution

Question 10

$$2,4$$-Dimethylpentan$$-2-$$ol

$$2,4$$-Dimethylpentan$$-4-$$ol

$$2,2$$-Dimethylbutane

Butanol$$-2-$$one

Solution

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