Hydrocarbons Test

Result

Hydrocarbons Test - 40

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Weekly Quiz Competition

Question 1
1 / -0

Hydrogen bromide can be added to T to give compound U. Compound U can be hydrolysed to compound V.
Four students, W, X, Y and Z, made the following statements.
W. All the atoms in a molecule of compound T lie in the same plane.
X. Compound V contains only one chiral centre.
Y. Step$$1$$ is an electrophilic addition reaction.
Z. Step $$2$$ is a nucleophilic substitution reaction.
Which two students are correct?

A
W and Y

B
W and Z

C
X and Y

D
Y and Z

Solution

Addition of $$HBr$$ to an alkene is an electrophilic addition reaction and hydrolysis of alkyl halides is a nucleophilic substitution reaction.
Hence $$Y$$ and $$Z$$ are correct.
Question 2
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Which process is used to make an alkene from a long-chain alkane?

A
Combustion

B
Condensation

C
Cracking

D
Polymerisation

Solution

Solution:- (C) Cracking
Cracking is the breakdown of a large alkane into smaller alkenes.
$$CH_3-CH_2-CH_3\xrightarrow{Cracking} CH_2=CH_2+CH_4$$
Question 3
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Which reaction would not give propene?

A
Adding excess hot concentrated sulfuric acid to $$propan-1-ol$$

B
Adding warm aqueous sodium hydroxide to $$2-bromopropane$$

C
Adding warm ethanolic sodium hydroxide to $$1-bromopropane$$

D
Passing $$propan-2-ol$$ vapour over heated aluminium oxide

Solution

Adding warm aqueous sodium hydroxide to $$2$$−bromopropane will give Propane-$$2$$-ol.
$${H}_{3}C-\overset{\underset{|}{Br}}{CH}-C{H}_{3} + NaOH \longrightarrow {H}_{3}C-\overset{\underset{|}{OH}}{CH}-C{H}_{3} + NaBr$$
Question 4
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Major product of following reaction :
$$CH_3 \underset{CH_3}{\underset{|}{\overset{CH_3}{\overset{|}{C}}}} - \underset{Cl}{\underset{|}{CH}} - CH_3 \, \xrightarrow{C_2H_5O^-}$$

A
$$CH_3 - \overset{CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}} - \underset{OC_2H_5}{\underset{|}{CH}} - CH_3$$

B
$$CH_3 - \underset{CH_3}{\underset{|}{\overset{CH_3}{\overset{|}{C}}}} - CH = CH_2$$

C
$$CH_3 - \overset{CH_3}{\overset{|}{C}} = \underset{CH_3}{\underset{|}{C}} - CH_3$$

D
$$CH_3 - \overset{CH_3}{\overset{|}{\underset{OC_2H_5}{\underset{|}{C}}}} - \overset{CH_3}{\overset{|}{CH}} - CH_3$$

Solution

$$CH_3 - \overset{CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}} - \underset{OC_2H_5}{\underset{|}{CH}} - CH_3$$
Question 5
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The molecular formula of Ethyne is ______

A
$$C_3H_6 $$

B
$$C_2H_4$$

C
$$C_2H_2$$

D
$$C_2H_6$$

Solution

The molecular formula of Ethyne is $$C_2H_2$$ and it is the simplest alkyne with a carbon-carbon triple bond.
Question 6
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The IUPAC name of the given compound is

A
3,3-dimethyl-1-hyclohexanedroxy cy

B
1,1-dimethyl-3-hydroxy cyclohexane

C
3,3-dimethyl-1-cyclohexanol

D
1,1-dimethyl-3-cyclohexanol

Solution

Ring is cyclohexane so name of this compound is
3,3-dimethyl-1-cyclohexanol
Question 7
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The compounds given below are:

A
enantiomers

B
identical

C
regiomers

D
diastereomers

Solution
Question 8
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The IUPAC name of the given is

A
3-methyl cyclohexene

B
1-methyl cyclohex-2-ene

C
6-methyl cyclohexene

D
1-methyl cyclohex-5-ene

Solution

Correct IUPAC name is
3-methyl cyclohexene
Question 9
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The IUPAC name of the given compound is

A
3-phenylbutane

B
3-cyclohexybutane

C
2-cyclohexylbutane

D
2-ohenylbutane

Solution

The correct name is given compound is
2-ohenylbutane
D is correct option
Question 10
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The IUPAC name of the following compound is :
$${CH}_{3}-CH=CH-C\equiv CH$$

A
Pent-4-yn-2-ene

B
Pent-2-en-4-yne

C
Pent-3-en-1-yne

D
Pent-1-yn-3-ene

Solution