Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is extracted from the roots of the valerian plant?

A
$$CH_{3} -(CH_{2})_{3} - COOH$$

B
$$CH_{3} - CH_{2} - COOH$$

C
$$CH_{3} -(CH_{2})_{2} - COOH$$

D
$$CH_{3} -(CH_{2})_{4} - COOH$$

Solution

Valeric acid is derived from the roots of Valerian Plant.
Valeric acid is $$CH_{3}-CH_{2}-CH_{2}-CH_{2}-COOH$$.
Question 2
1 / -0

Which of these contains the carbonyl group?

A
ketones

B
aldehydes

C
carboxylic Acids

D
all of these

Solution

Carbonyl group is $$-C=O$$, which is present in ketones, aldehydes and carboxylic acids, etc. having a functional group $$-C=O$$, $$-CHO$$ and $$-COOH$$ respectively.
Question 3
1 / -0

The functional groups present in the following compound is:
$$CH_{3} CH_{2} CH_{2} CH_{2} CHO$$

A
alcohol

B
ketone

C
carboxylate

D
aldehyde

Solution

The functional group present in the compound; $$CH_{3}-CH_{2}-CH_{2}-CH_{2}-CHO$$ is an aldehyde group, $$-CHO.$$
Question 4
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The functional group present in $$CH_{3}COOC_{2}H_{5}$$ is :

A
ketonic

B
aldehydic

C
ester

D
carboxylic

Solution

The compound with the general formula $$R-COO{R}'$$ is called ester.

It's functional group is $$-COO-$$.

Option C is correct.
Question 5
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Which of the following is incorrectly matched?

A
Vinegar $$\rightarrow $$ Carboxylic Acid

B
$$C_{2}H_{6} \rightarrow $$ Alkane

C
Ethanol $$\rightarrow$$ Alcohol

D
Methanol $$\rightarrow$$ Ketone

Solution

(A) Vinegar is acetic acid belongs to carboxylic acid and has a functional group $$-COOH$$.

(B) $$C_2H_6$$ is belongs to the family of alkane as it has follows general formula $$C_nH_{2n+2}$$.

(C) ethanol belongs to the alcohol family, it has a functional group $$-OH$$.

(D) But Methanol belongs to alcohol family not in the ketone family. It has a functional group $$-OH$$.

Hence, option D is incorrectly matched.
Question 6
1 / -0

The functional groups present in the following compound is:
$$CH_{3} CH_{2} OH$$

A
ketone

B
alcohol

C
aldehyde

D
carboxylate

Solution

The functional group in $$CH_{3}-CH_{2}-OH$$ is an alcoholic group, $$-OH$$.
Question 7
1 / -0

Which of the following is/are functional groups?

A
Hydroxyl group

B
Aldehyde group

C
Carboxylic group

D
All of the above

Solution

In organic chemistry, functional groups are specific groups of atoms or bonds within molecules that are responsible for the characteristic chemical reactions of those molecules.
Examples: (i) alcoholic group (-OH)
(ii) aldehyde group (-CHO)
(iii) ketone group (-CO)
(iv) carboxylic acid group (-COOH)
Question 8
1 / -0

Observe the following pairs of organic compounds:

(I) $$C_{4}H_{9}OH$$ and $$C_{5}H_{11} OH$$
(II) $$C_{5}H_{11} OH$$ and $$C_{7}H_{15}OH$$
(III) $$C_{3}H_{7}OH$$ and $$C_{6}H_{13}OH$$

Which of these pairs belong to the same homologous series?

A
(III) only

B
(II) only

C
(I) only

D
All of these

Solution

Homologous series is a series of compounds with similar chemical properties and the same functional group, differing from the successive member by $$-CH_2$$.

When we observe in $$(I)$$, molecules differ by $$-CH_2$$
When we observe in $$(II)$$, molecules differ by $$-C_2H_4$$
When we observe in $$(III)$$, molecules differ by $$-C_3H_6$$

All these molecules differ by a multiple of $$-CH_2$$ and have the same functional group, hence all these molecules belong to the same homologous series.
Question 9
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All homologues have similar but graded:

A
solubility

B
melting point

C
boiling point

D
All of the above

Solution

Organic compounds that are part of the same homologous series generally have similar chemical properties as each other, due to the presence of the same functional grup in the molecules of all compounds in the series.
But they graded in physical properties, like solubility, melting, and boiling point of homologous series register a gradual changes. They increases as one move from lower to the higher series of member. Thus all homologues have similar but graded physical properties.
Question 10
1 / -0

Compound $$CH_3CH_2CH(CH_3)CH_2COCl$$ has the IUPAC name_______.

A
3-methylpentanoyl chloride

B
1-chloroformyl-2-methylbutane

C
1 -cloroformyl-1-secbutylmethane

D
none of the above

Solution

IUPAC Name of this compound is;
$$C\overset {5}{H_{3}}\overset {4}{CH_{2}} \underset {\underset {CH_{3}}{|}}{\overset {2}{CH}} \overset {2}{CH_{3}} \overset {1}{CO}Cl$$
$$A)\rightarrow 3- methyl\ pentanoyl\ chloride$$.

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Organic Chemistry Some Basic Principles and Techniques Test - 17

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Organic Chemistry Some Basic Principles and Techniques Test - 17

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Question 1

$$CH_{3} -(CH_{2})_{3} - COOH$$

$$CH_{3} - CH_{2} - COOH$$

$$CH_{3} -(CH_{2})_{2} - COOH$$

$$CH_{3} -(CH_{2})_{4} - COOH$$

Solution

Question 2

ketones

aldehydes

carboxylic Acids

all of these

Solution

Question 3

alcohol

ketone

carboxylate

aldehyde

Solution

Question 4

ketonic

aldehydic

ester

carboxylic

Solution

Question 5

Vinegar $$\rightarrow $$ Carboxylic Acid

$$C_{2}H_{6} \rightarrow $$ Alkane

Ethanol $$\rightarrow$$ Alcohol

Methanol $$\rightarrow$$ Ketone

Solution

Question 6

ketone

alcohol

aldehyde

carboxylate

Solution

Question 7

Hydroxyl group

Aldehyde group

Carboxylic group

All of the above

Solution

Question 8

(III) only

(II) only

(I) only

All of these

Solution

Question 9

solubility

melting point

boiling point

All of the above

Solution

Question 10

3-methylpentanoyl chloride

1-chloroformyl-2-methylbutane

1 -cloroformyl-1-secbutylmethane

none of the above

Solution

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