Hydrocarbons Test

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Hydrocarbons Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

Oxiran is

A
Ethylene oxide

B
Diethyl ether

C
Ethyl glycolate

D
Glycolic ester

Solution

Oxiran is ethylene oxide,
Question 2
1 / -0

The correct structure of benzene was proposed by

A
Faraday

B
Davy

C
Kekule

D
Wohler

Solution

The structure of benzene has been of interest since its discovery. German chemists Joseph Loschmidt (in 1861) and August Kekule von Stradonitz (in 1866) independently proposed a cyclic arrangement of six carbons with alternating single and double bonds.
Question 3
1 / -0

Benzene shows

A
Substitution

B
Addition

C
Oxidation

D
All of these

Solution

There are delocalised electrons above and below the plane of the ring. The presence of the delocalised electrons makes benzene particularly stable. Benzene resists addition reactions because that would involve breaking the delocalisation and losing that stability.

An alkylbenzene is simply a benzene ring with an alkyl group attached to it. ... Alkyl groups are usually fairly resistant to oxidation. However, when they are attached to a benzene ring, they are easily oxidised by an alkaline solution of potassium manganate(VII) (potassium permanganate).

Hence Option D is a correct answer.
Question 4
1 / -0

Which alkene is formed from the following reaction $$ CH_3CH_2CH_2CH = PPh_3 + 2$$ - Butanone

A
$$3$$-Methyl -$$3$$-heptene

B
$$4$$-Methyl -$$3$$-heptene

C
$$5$$-Methyl -$$3$$-heptene

D
$$1$$-Methyl -$$5$$-methane

Solution

$$ CH_3 $$
$$ \mid $$
$$ CH_3CH_2 - C = O + CH_3CH_2CH_2CH = PPh_3 $$
$$ 2$$-Butanone
$$ CH_3 $$
$$ \mid $$
$$ \rightarrow \, CH_3CH_2C =CHCH_2CH_2CH_3 + Ph_3PO $$
$$ 3$$-methyl-$$3$$-heptene

Option A is correct.
Question 5
1 / -0

The number of possible isomers of butene are

A
$$3$$

B
$$2$$

C
$$4$$

D
$$5$$

E
$$6$$

Solution

There are $$cis-$$ and $$trans-$$ isomers of 2-butene is also possible.
So total 4 possible isomers.
Question 6
1 / -0

Silver acetylide when heated with $$HCl$$ gives ?

A
$$C_2H_2$$

B
$$H_2$$

C
$$C_2H_4$$

D
None of these

Solution

$$Ag - C \equiv C - Ag + 2HCl \rightarrow CH \equiv CH + 2AgCl$$
Question 7
1 / -0

By heating a mixture of $$CHCl_3$$ with silver powder , the compound formed is

A
Acetylene

B
Silver acetate

C
Methanol

D
None of these

Solution

Silver Powder : Reaction with Ag powder or Dehalogenation : On heating chloroform with Silver powder, pure acetylene gas is formed

Hence A is corret answer
Question 8
1 / -0

Methyl chloride reacts with silver acetate to yield

A
Acetaldehyde

B
Acetyl chloride

C
Methyl acetate

D
Acetic acid

Solution

Methyl chloride reacts with silver acetate to yield methyl acetate and silver chloride.

because of A reaction in which any two or more reactant species chemically combine together and then they tend to form a new compound (called product) is known as a chemical reaction

Hence C is correct answer
Question 9
1 / -0

Write the product of the addition reaction

$$> C = C < + XY \rightarrow$$

A
$$> \underset{X}{\underset{|}{C}} - \underset{Y}{\underset{|}{C}}<$$

B
$$X - \underset{|}{C} = \underset{|}{C} - Y$$

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

D
$$X - \overset{|}{\underset{|}{C}} - \overset{|}{\underset{|}{C}} - X$$

Solution

Addition reaction means addition on double bond. So, the product form will be $$> \underset{X}{\underset{|}{C}} - \underset{Y}{\underset{|}{C}}<$$.
Question 10
1 / -0

Which of the following is not aromatic?

A
Benzene

B
Naphthalene

C
Pyridine

D
$$1,3,5-$$ heptatriene

Solution

A compound is said to be aromatic if it is planar and there is complete delocalization of $$\pi$$ electrons, which is only possible if it is a conjugated cyclic system and the number of electrons used in delocalization is $$(4n + 2). 1, 3, 5-$$ heptatriene is not an aromatic compound because complete delocalization of pi electrons is not possible in it and it is not planar.

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Hydrocarbons Test - 49

Result

Hydrocarbons Test - 49

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SHARING IS CARING

Question 1

Ethylene oxide

Diethyl ether

Ethyl glycolate

Glycolic ester

Solution

Question 2

Faraday

Davy

Kekule

Wohler

Solution

Question 3

Substitution

Addition

Oxidation

All of these

Solution

Question 4

$$3$$-Methyl -$$3$$-heptene

$$4$$-Methyl -$$3$$-heptene

$$5$$-Methyl -$$3$$-heptene

$$1$$-Methyl -$$5$$-methane

Solution

Question 5

$$3$$

$$2$$

$$4$$

$$5$$

$$6$$

Solution

Question 6

$$C_2H_2$$

$$H_2$$

$$C_2H_4$$

None of these

Solution

Question 7

Acetylene

Silver acetate

Methanol

None of these

Solution

Question 8

Acetaldehyde

Acetyl chloride

Methyl acetate

Acetic acid

Solution

Question 9

$$> \underset{X}{\underset{|}{C}} - \underset{Y}{\underset{|}{C}}<$$

$$X - \underset{|}{C} = \underset{|}{C} - Y$$

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

$$X - \overset{|}{\underset{|}{C}} - \overset{|}{\underset{|}{C}} - X$$

Solution

Question 10

Benzene

Naphthalene

Pyridine

$$1,3,5-$$ heptatriene

Solution

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