Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

IUPAC name of compound $$C_{4}H_{9}SH$$ is______.

A
butanol

B
butanethiol

C
butanesol

D
butanol sulphur

Solution

Butanethiol is also known as butyl mercaptan is a volatile yellow liquid. It is classified as thiols similar to alcohol except sulfhydryl group -SH- replacing hydroxyl group.
Question 2
1 / -0

Pick out a set of homologues:

A
$$C_2H_6, C_2H_4, C_2H_2, C_2H_5$$

B
$$C_{6}H_{6}, C_{7}H_{8}, C_{9}H_{10}, C_{9}H_{14}$$

C
$$CH_4, C_2H_6, C_3H_8, C_4H_{10}$$

D
$$C_2H_2, C_3H_4,, C_4H_6, C_4H_{10}$$

Solution

homologous series have compounds that differ by $$-CH_2$$ group. and have the same functional group (example alkane, alkene, alcohols, etc.)

Option A is incorrect as it has only 2 carbon atoms in all the compounds.
Option B is incorrect because the first compound is benzene, and others cannot be homologous compounds.
Option C is correct as it is the homologous series of alkanes.
Option D is incorrect because the first compound is alkyne and the last compound is alkane.

So, the correct option is $$C$$
Question 3
1 / -0

The general formula $$C_{n}H_{2n}O_{2}$$ could be for open chain:

A
diketones

B
carboxylic acids

C
diols

D
dialdehydes

Solution

The general formula $$C_{n}H_{2n}O_{2}$$ could be for open chain carboxylic acids. Thus, butanoic acid $$\displaystyle CH_3-CH_2-CH_2-COOH$$ has formula $$\displaystyle C_4H_8O_2$$. And, decanoic acid $$\displaystyle CH_3-(CH_2)_8-COOH$$ has formula $$\displaystyle C_{10}H_{20}O_2$$
Question 4
1 / -0

The number of sigma and pi bonds in benzene are:

A
$$6\sigma$$ and $$3\pi$$

B
$$12\sigma$$ and $$3\pi $$

C
$$9\sigma$$ and $$3\pi$$

D
$$6\sigma$$ and $$6\pi $$

Solution

A sigma bond is a covalent bond which is formed by the head on an overlap of two atomic orbitals. But there can be a maximum of two pieces bond between two atoms in a molecule.
For example, if there is a single bond between two atoms, then the bond will be sigma bond. pi bond are covalent chemical bond here two lobes of an orbital on one atom overlap two lobes of an orbital on another atom. Each of these atomic orbitals has zero electron density at a shared nodal plane, passing through the two bonded nuclei.
Question 5
1 / -0

IUPAC name of the compound ?

A
hexanoic acid 5 - al - 1

B
6-oxohexanoic acid

C
hexanal-1-carboxylic acid

D
none of these

Solution

Following steps are followed while naming the compound; $$CHO-(CH_{2})_{6}COOH$$:
i) The parent chain consists of 8 carbon atoms and the primary functional group is;$$ -COOH$$ , thus the suffix -oic acid is used.
ii)$$ -CO$$ is the secondary functional group and the prefix -oxo is used for it.
iii) The numbering of the compound is done from right to left as the lowest number is given to the primary functional group; $$-COOH$$.
Thus the name of the compound is; 6-oxohexanoic acid.
Question 6
1 / -0

Which of the following is crotonic acid?

A
$$\displaystyle CH_{2}=CH-COOH$$

B
$$\displaystyle C_{6}H_{5}-CH=CH-COOH$$

C
$$\displaystyle CH_{3}-CH=CH-COOH$$

D
$$\displaystyle C_{6}H_{5}-COOH$$

Solution

The structure of crotonic acid is $$\displaystyle CH_{3}-CH=CH-COOH$$. It is an unsaturated acid.

So, the correct option is $$C$$
Question 7
1 / -0

The members of a homologous series differ in their molecular weight by

A
14 or its multiple.

B
7 or its multiple.

C
12 or its multiple.

D
4 or its multiple.
Question 8
1 / -0

IUPAC name of this compound is:

A
ethyl-4-methyl-3-oxopentanoate

B
2-ethoxycarbonylpentan-3-one

C
4-ethoxycarbonylpentan-3-one

D
ethyl-2-methyl-3-oxopentanoate

Solution

Starts numbering from ester carbon atom, and the name of the compound would be ethyl-2-methyl-3-oxopentanoate.
Question 9
1 / -0

$$CCl_3 - CHO$$ in IUPAC system is called:

A
chloral

B
1, 1, 1-trichloroethanal

C
2, 2, 2-trichloroethanal

D
Trichloroacetaldehyde

Solution

IUPAC name of $$Cl_{3}C-CHO$$ is 2,2,2-trichloroethanal, as the functional group is aldehyde and is cited first than the three chloro groups .
Question 10
1 / -0

Which among the following is/are natural source(s) of organic compounds ?

A
coal

B
natural gas

C
petroleum

D
all of the above

Solution

Some natural sources for organic compounds are coal, plants, natural gas, petroleum etc.

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Re-Attempt Weekly Quiz Competition

Organic Chemistry Some Basic Principles and Techniques Test - 18

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Organic Chemistry Some Basic Principles and Techniques Test - 18

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Question 1

butanol

butanethiol

butanesol

butanol sulphur

Solution

Question 2

$$C_2H_6, C_2H_4, C_2H_2, C_2H_5$$

$$C_{6}H_{6}, C_{7}H_{8}, C_{9}H_{10}, C_{9}H_{14}$$

$$CH_4, C_2H_6, C_3H_8, C_4H_{10}$$

$$C_2H_2, C_3H_4,, C_4H_6, C_4H_{10}$$

Solution

Question 3

diketones

carboxylic acids

diols

dialdehydes

Solution

Question 4

$$6\sigma$$ and $$3\pi$$

$$12\sigma$$ and $$3\pi $$

$$9\sigma$$ and $$3\pi$$

$$6\sigma$$ and $$6\pi $$

Solution

Question 5

hexanoic acid 5 - al - 1

6-oxohexanoic acid

hexanal-1-carboxylic acid

none of these

Solution

Question 6

$$\displaystyle CH_{2}=CH-COOH$$

$$\displaystyle C_{6}H_{5}-CH=CH-COOH$$

$$\displaystyle CH_{3}-CH=CH-COOH$$

$$\displaystyle C_{6}H_{5}-COOH$$

Solution

Question 7

14 or its multiple.

7 or its multiple.

12 or its multiple.

4 or its multiple.

Question 8

ethyl-4-methyl-3-oxopentanoate

2-ethoxycarbonylpentan-3-one

4-ethoxycarbonylpentan-3-one

ethyl-2-methyl-3-oxopentanoate

Solution

Question 9

chloral

1, 1, 1-trichloroethanal

2, 2, 2-trichloroethanal

Trichloroacetaldehyde

Solution

Question 10

coal

natural gas

petroleum

all of the above

Solution

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