Carbon and its Compounds Test

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Carbon and its Compounds Test - 35

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Question 1
1 / -0

Hydrogenation of alkyne may give :

A
alkane

B
alkene

C
both alkane and alkene

D
polymer

Solution

Hydrogenation of alkyne is an addition of hydrogen to the multiple bond. Based on the availability of hydrogen and type of catalyst present in the reaction, alkane and alkenes can form.
Question 2
1 / -0

______ is the perfectly crystalline allotrope of carbon.

A
Coal

B
Coke

C
Diamond

D
Wood

Solution

Different physical forms of the same element in which it can exist are called allotropes. Besides graphite, the other allotropes of crystalline carbon are diamond and fullerenes
Hence, the correct option is $$C$$.
Question 3
1 / -0

Graphite is a conductor of electricity because

A
it has free valence electrons.

B
it is a non-metal form of carbon.

C
it is an allotrope of carbon.

D
Both A and B.

Solution

Graphite is a conductor of electricity because as can be seen in the crystal structure of graphite (in the figure) it has free valence electrons which can conduct electricity.
Graphite displays the property of both metal and non-metal. As a metal, graphite is a good conductor of electricity due to the mobility of electrons in outer valence shells.
Question 4
1 / -0

The formula of methane is $$CH_4$$ and its succeeding member ethane is expressed in $$C_2 H_6$$. The common difference of succession between them is:

A
$$CH_2$$

B
$$C_2H_2$$

C
$$CH_4$$

D
None of the above

Solution

Methane and ethane are alkanes. These are saturated carbon compounds. They have the general formula $$C_nH_{2n+2}$$. All the alkanes differ by $$CH_2$$ group successively in the series.
Question 5
1 / -0

An element $$X$$ has $$6$$ electrons in its outermost shell. Then the number of electrons shared by $$X$$ with another atom to form a covalent bond is:

A
$$3$$

B
$$2$$

C
$$6$$

D
$$4$$

Solution

No. of electrons in the outermost shell of an element $$X=6$$

$$\therefore$$ In a covalent bond, we share one/more electron pairs.

So, to form a covalent bond, it needs one pair of electrons(2 electrons) to complete its octet.

Hence, option B is correct.
Question 6
1 / -0

Valency of carbon is:

A
1

B
4

C
3

D
2
Solution
Hint: Valency of carbon can be defined as combining power with hydrogen.

Explanation:
- The number of valence electrons in the outermost shell in carbon is $$4$$.
- To attain noble gas configuration carbon makes $$4$$ bonds with carbon.
- Therefore, Carbon is tetravalent.
Hence, correct option is $$4$$.
Question 7
1 / -0

$$CH_4$$ is a /an _____________ compound.

A
Ionic

B
Covalent

C
Both a and b

D
None of these

Solution

$$CH_{4}$$ is correct covalent compound as it is formed by sharing of $$e^{-}$$.
Question 8
1 / -0

The chlorination of methane is an example of:

A
addition

B
elimination

C
substitution

D
None of the above

Solution

Saturated hydrocarbons are fairly unreactive and are inert in the presence of most reagents. However, in the presence of sunlight, chlorine is added to hydrocarbons in a very fast reaction. Chlorine can replace the hydrogen atoms one by one. It is called a substitution reaction because one type of atom or a group of atoms takes the place of another.
$$\displaystyle CH_4 + Cl_2 \xrightarrow {h \nu} CH_3-Cl + HCl$$
Question 9
1 / -0

In homlogous series, successive members differ by:

A
$$CH_{3}-$$

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

C
$$-CH_{2}-$$

D
$$-H$$

Solution

A homologous series is a series of compounds in which each member differs from the next/previous by $$-C{ H }_{ 2 }-$$ or 14 mass units. Physical properties change in members of homologous series but chemical properties remain almost the same because the functional group remains the same.
Question 10
1 / -0

Among the given compounds, which can have triple bond?
$$C_2H_4$$, $$C_3H_4$$, $$C_3H_6$$.

A
$$C_2H_4$$

B
$$C_3H_4$$

C
$$C_3H_6$$

D
All of these

Solution