Chemistry Practice MCQs Chapter 9 Class 12


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Created on By Ali Durrani

Chemistry Ch 9 Class 12 Hydrocarbons

1 / 63

Which of the following statements is incorrect about benzene?

2 / 63

Which of the following is NOT explained by Kekule structure of benzene?

PMC Sample 2
Chemistry
Hydrocarbons
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3 / 63

n-Heptane can be converted into benzene by catalysts:

4 / 63

Which of the following compounds react slower than benzene in electrophilic substitution reaction?

NUMS 2019 Reconduct
Chemistry
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5 / 63

If both double and triple bonds are present in the chain, double bond is given the ______

PMC Sample 2
Chemistry
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6 / 63

Acetylene on reacting with ammonium silver nitrate gives.

NUMS 2014
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7 / 63

The reaction of benzene with bromine gives?

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The C-H bond distance is the longest in:

NUMS 2015
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9 / 63

Methane gas is also known as

PMC Sample 2
Chemistry
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10 / 63

The hybridization of benzene is:

11 / 63

Physical properties of Ethyne is/are:

NTS 2015 DUHS and JSMU
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12 / 63

PolymerizatIon of ______ produces synthetic rubber.

PMC Sample 1
Chemistry
Hydrocarbons
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13 / 63

The bond angles in benzene ring are:

PMC Sample 1
Chemistry
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14 / 63

Activation of the benzene ring in aniline can be decreased by treating with:

NUMS 2017
Chemistry
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15 / 63

Which catalyst is used to oxidize benzene rings?

NUMS 2019 Reconduct
Chemistry
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16 / 63

What happens when one mole of ethane is mixed in the dark at room temperature with six moles of chlorine?

NTS 2017
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17 / 63

Boiling point of benzene is:

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The unhybridized p orbitals of benzene are present in the form of _________.

PMC Practice 2
Chemistry
Hydrocarbons
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19 / 63

Acetylene polymerizes to make:

PMC Sample 3
Chemistry
Hydrocarbons
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20 / 63

Friedel craft’s reaction gives?

21 / 63

The four bonds of carbon in methane are directed towards the corners of a:

NUMS 2014
Chemistry
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22 / 63

Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent?

NUMS 2014
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23 / 63

Which of the following gases is used for welding purpose:

NTS 2019
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24 / 63

Alkenes undergo:

UHS 2019
Chemistry
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25 / 63

How many chain isomers of Pentane is possible?

PMC Practice 1
Chemistry
Hydrocarbons
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26 / 63

Benzene when reacted with chlorine in ultraviolet rays produces:

27 / 63

Name the main product formed as a result of the following reaction

H3C – (CH2)5 – CH3 ————> Product

n-heptane

Conditions: 480 – 550 C, 150 – 399 psi V2O5

NTS 2019
Chemistry
Hydrocarbons
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28 / 63

Reduction of benzene is presence of Ni gives:

NUMS 2019 Cancelled
Chemistry
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29 / 63

Which one of the following organic compounds have the least carbon-carbon bond length?

NUMS 2017
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30 / 63

The structure of cyclohexane is:

PMC Sample 3
Chemistry
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31 / 63

Which type of hybridization takes place in benzene?

32 / 63

Alkenes are:

PMC Sample 3
Chemistry
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33 / 63

What is the color of silver acetylide, AgC=CAg?

PMC Practice 2
Chemistry
Hydrocarbons
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34 / 63

Which of the following Is formula of Benzyl Alcohol?

35 / 63

Organic compounds in which tetravalency of carbon atom is satisfied are called as ____ ?

PMC Practice 1
Chemistry
Hydrocarbons
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36 / 63

Stability of benzene is due to

37 / 63

Benzene with nitrating mixture gives?

38 / 63

Which one of the following is the correct structure of 2,2-Dimethylbutane?

PMC Sample 1
Chemistry
Hydrocarbons
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39 / 63

Acetylene upon heating at 300 C gives:

40 / 63

In which of the following cases are the benzene rings isolated?

NUMS 2015
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41 / 63

Hydrocarbons which burn with a smoky flame are called:

NUMS 2015
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42 / 63

How many Dewar Structure of Benzene are present?

43 / 63

In composition of natural gas, 0.17% is constituted by:

NUMS 2018
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44 / 63

Alkaline KMnO4 converts ethylene into:

NUMS 2014
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45 / 63

C6H5 Is:

46 / 63

The carbon number of gasoline is:

NTS 2019
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47 / 63

How many chain isomers are possible for the alkane C6H14?

NTS 2016 SMBBMC
Chemistry
Hydrocarbons
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48 / 63

Which derivative of benzene shows maximum reactivity in electrophilic substitution reactions?

UHS 2019
Chemistry
Hydrocarbons
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49 / 63

Friedel-Crafts Reaction can be used for the preparation of :

50 / 63

Which type of bonds are broken during cracking?

PMC Practice 1
Chemistry
Hydrocarbons
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51 / 63

Gasoline is a mixture of?

NUMS 2018
Chemistry
Hydrocarbons
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52 / 63

All of the following react with KMnO4 except

NUMS 2017
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53 / 63

The position of the double bond in alkenes can be identified by:

PMC Sample 3
Chemistry
Hydrocarbons
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54 / 63

Which of the following method is used to prepare Ethylene glycol from ethene?

PMC Practice 1
Chemistry
Hydrocarbons
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55 / 63

Name the main product formed as a result of the following reaction

H3C – (CH2)5 – CH3 ————> Product

n-heptane

Conditions: 480 – 550 C, 150 – 399 psi V2O5

NTS 2019
Chemistry
Hydrocarbons
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56 / 63

Which one of the following is not a heterocyclic compound?

PMC Sample 3
Chemistry
Hydrocarbons
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57 / 63

What are the products of destructive distillation of coal?

PMC Practice 1
Chemistry
Hydrocarbons
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58 / 63

The ratio of σ to π bonds in benzene is:

NUMS 2019 Reconduct
Chemistry
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59 / 63

Benzene is prepared in laboratory by distillation of phenol with

60 / 63

Who rejected vital force theory

PMC Sample 3
Chemistry
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61 / 63

Free radical reactions take place in the presence of ______?

PMC Practice 1
Chemistry
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62 / 63

Fuels with higher octane number can be produced by ___________.

PMC Practice 2
Chemistry
Hydrocarbons
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63 / 63

Catalytic hydrogenation of alkenes exhibits:

NUMS 2019 Cancelled
Chemistry
Hydrocarbons
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