Hydrocarbons Test

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Hydrocarbons Test - 50

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Weekly Quiz Competition

Question 1
1 / -0

In the reaction $C_{2}H_{5}CH=CH_{2}+H-X\rightarrow Product$ What is the product

A
$C_{2}H_{5}-CH_{3}$

B
$C_{2}H_{5}CH_{2}-CH_{2}X$

C
$C_{2}H_{5}-CHX-CH_{3}$

D
$CH_{3}-CH_{2}X-CH=CH_{2}$

Solution

$C_{2}H_{5}CH=CH_{2}+H-X\rightarrow$ $C_{2}H_{5}-CHX-CH_{3}$
When halide react with 1 butene then tere will be a two product is possible.
1. $C_{2}H_{5}-CHX-CH_{3}$
2. $C_{2}H_{5}-CH_2-CHX3$
But 90%of the product is $C_{2}H_{5}-CHX-CH_{3}$
And 10% is $C_{2}H_{5}-CH_2-CHX3$ .
Therefore our answer is Option C.
Question 2
1 / -0

Oils are converted into fats by

A
Hydration

B
Decarboxylation

C
Hydrogentation

D
Dehydrogenation

E
Hydrogenolysis

Solution

$\text{Oil are unsaturated esters which are converted into fats by saturating it by catalytic hydrogenation.}$
Question 3
1 / -0

Which of the following occurs easily in ethylene?

A
Addition

B
Substitution

C
Elimination

D
Rearrangement

Solution

In case of ethene double bond is present. Hence, addition reactions occur easily.

Example: $CH_2=CH_2+HCl\to CH_3-CH_2Cl$
Question 4
1 / -0

The order of increasing reactivity towards $HCl$ of the following compounds will be
(1) $CH_{2}=CH_{2}$
(2) $(CH_{3})_{2}C=CH_{2}$
(3) $CH_{3}CH=CHCH_{3}$

A
$1<2<3$

B
$1<3<2$

C
$3<2<1$

D
$2<1<3$

Solution

The correct order of increasing reactivity towards HCl is
$CH_3CH = CHCH_3$ $<(CH_3) _2C = CH_2$ $<CH_2 = CH_2$ .
As the number of alkyl groups attached to the carbon atoms increases, the + I effect of the alkyl groups increases and the alkene becomes electron rich. Hence, the reactivity towards HCl increases as pi electrons of the double bond are donated to proton.
Also as the stability of alkene decreases (cis isomer is less stable than trans isomer), the reactivity towards acid catalyzed hydration increases.
Therefore, Option C is correct answer for this.
Question 5
1 / -0

Which of the following are formed on addition reaction of $DCI$ with 3-methyl-1-butene

A
$CH_{2}DCHClCH(CH_{3})_{2}$

B
$CH_{2}DCH_{2}CCl(CH_{3})_{2}$

C
$CH_{3}CDClCH(CH_{3})_{2}$

D
$ClCH_{2}CHDCH(CH_{3})_{2}$

Solution

Option A is a correct answer for this question.
Question 6
1 / -0

Which one of the following organic compounds decolourises an alkaline $KMnO_{4}$ solution?

A
$CS_{2}$

B
$C_{3}H_{6}$

C
$C_{3}H_{8}$

D
$CH_{3}OH$

Solution

$C_{3}H_{6}$ is an alkene therefore decolourises alkaline $KMnO_{4}$ solution.
Question 7
1 / -0

Protein can be most easily removed from

A
Alkanes

B
Alkenes

C
Alkynes

D
Benzene

Solution

because of insolubility of protein in benzene, protein can be easily removed from benzene.
Question 8
1 / -0

Which kind of isomerism will butene $-2$ show?

A
Geometrical

B
Optical

C
Position

D
None of these

Solution

$\text{2-Butene}$ shows geometrical isomerism.
Question 9
1 / -0

Elimination reaction of 2-bromo-pentane to form pent-2-ene is:
a) $\beta$ - Elimination reaction
b) Follows Zaitsev rule
c) Dehydrohalogenation reaction
d) Dehydration reaction

A
a), c), d)

B
b), c), d)

C
a), b), d)

D
a), b), c)

Solution

Refer above image,
This reaction is an example of $\beta$ - elimination.
Hydrogen is removed from $\beta$ - carbon and halogen from $\alpha$ - carbon, dehydrohalogenation reaction
Generally in E2 reaction Zaitsev alkene is formed as major product (more stable alkene)
Question 10
1 / -0

The correct IUPAC name of the following alkane is

A
$3,6$ -Diethyl- $2$ -methyl octane

B
$5$ -Isopropyl- $3$ -ethyl octane

C
$3$ -Ethyl- $5$ -isopropyl octane

D
$3$ -Isopropyl- $6$ -ethyl octane

Solution

The given alkane has the longest chain of $8$ carbon atoms hence , it is Octane .
Side chain on carbon $2,3$ and $6$ follow lowest sum rule.
On carbon $2$ -methyl , on carbon $3$ -and carbon- $6$ -ethyl groups are present. Ethyl comes before methyl (alphabetically) and two ethyl groups are there.
Hence the correct IUPAC name is $3,6$ -Diethyl- $2$ -methyloctane.

Hence, Option "A" is the correct answer.

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Hydrocarbons Test - 50

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Question 1

C2H5−CH3C_{2}H_{5}-CH_{3}C2​H5​−CH3​

C2H5CH2−CH2XC_{2}H_{5}CH_{2}-CH_{2}XC2​H5​CH2​−CH2​X

C2H5−CHX−CH3C_{2}H_{5}-CHX-CH_{3}C2​H5​−CHX−CH3​

CH3−CH2X−CH=CH2CH_{3}-CH_{2}X-CH=CH_{2}CH3​−CH2​X−CH=CH2​

Solution

Question 2

Hydration

Decarboxylation

Hydrogentation

Dehydrogenation

Hydrogenolysis

Solution

Question 3

Addition

Substitution

Elimination

Rearrangement

Solution

Question 4

1<2<31<2<31<2<3

1<3<21<3<21<3<2

3<2<13<2<13<2<1

2<1<32<1<32<1<3

Solution

Question 5

CH2DCHClCH(CH3)2CH_{2}DCHClCH(CH_{3})_{2}CH2​DCHClCH(CH3​)2​

CH2DCH2CCl(CH3)2CH_{2}DCH_{2}CCl(CH_{3})_{2}CH2​DCH2​CCl(CH3​)2​

CH3CDClCH(CH3)2CH_{3}CDClCH(CH_{3})_{2}CH3​CDClCH(CH3​)2​

ClCH2CHDCH(CH3)2ClCH_{2}CHDCH(CH_{3})_{2}ClCH2​CHDCH(CH3​)2​

Solution

Question 6

CS2CS_{2}CS2​

C3H6C_{3}H_{6}C3​H6​

C3H8C_{3}H_{8}C3​H8​

CH3OHCH_{3}OHCH3​OH

Solution

Question 7

Alkanes

Alkenes

Alkynes

Benzene

Solution

Question 8

Geometrical

Optical

Position

None of these

Solution

Question 9

a), c), d)

b), c), d)

a), b), d)

a), b), c)

Solution

Question 10

3,6 3,63,6-Diethyl-222-methyl octane

5 55-Isopropyl-333-ethyl octane

333-Ethyl-555-isopropyl octane

333-Isopropyl-666-ethyl octane

Solution

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$C_{2}H_{5}-CH_{3}$

$C_{2}H_{5}CH_{2}-CH_{2}X$

$C_{2}H_{5}-CHX-CH_{3}$

$CH_{3}-CH_{2}X-CH=CH_{2}$

$1<2<3$

$1<3<2$

$3<2<1$

$2<1<3$

$CH_{2}DCHClCH(CH_{3})_{2}$

$CH_{2}DCH_{2}CCl(CH_{3})_{2}$

$CH_{3}CDClCH(CH_{3})_{2}$

$ClCH_{2}CHDCH(CH_{3})_{2}$

$CS_{2}$

$C_{3}H_{6}$

$C_{3}H_{8}$

$CH_{3}OH$

$3,6$ -Diethyl- $2$ -methyl octane

$5$ -Isopropyl- $3$ -ethyl octane

$3$ -Ethyl- $5$ -isopropyl octane

$3$ -Isopropyl- $6$ -ethyl octane