Class 12 Exam  >  Class 12 Tests  >  Hydrocarbons - Class 12 MCQ

Hydrocarbons - Class 12 MCQ


Test Description

30 Questions MCQ Test - Hydrocarbons

Hydrocarbons for Class 12 2024 is part of Class 12 preparation. The Hydrocarbons questions and answers have been prepared according to the Class 12 exam syllabus.The Hydrocarbons MCQs are made for Class 12 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Hydrocarbons below.
Solutions of Hydrocarbons questions in English are available as part of our course for Class 12 & Hydrocarbons solutions in Hindi for Class 12 course. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free. Attempt Hydrocarbons | 30 questions in 45 minutes | Mock test for Class 12 preparation | Free important questions MCQ to study for Class 12 Exam | Download free PDF with solutions
1 Crore+ students have signed up on EduRev. Have you? Download the App
Hydrocarbons - Question 1

Among the following, the compound which has highest boiling point is :

Detailed Solution for Hydrocarbons - Question 1

Boiling point depends upon intermolecular forces, favoured by no. of C-atoms & decreases with increases in branching

Hydrocarbons - Question 2

Propane can be best prepared by the reaction :

Detailed Solution for Hydrocarbons - Question 2

Corey-House reaction follows mechanism, which is used for preparation unsymmetrical alkanes.

Hydrocarbons - Question 3

Which statement is incorrect about free radical halogenation of alkanes?

Detailed Solution for Hydrocarbons - Question 3

Organic peroxides favour free redical mechanism

Hydrocarbons - Question 4

Consider the following reaction :

The major products formed in this reaction are :

Detailed Solution for Hydrocarbons - Question 4

In the presence of peroxides, free radical mechanism or homolytic cleavage is favoured.

Hydrocarbons - Question 5

Detailed Solution for Hydrocarbons - Question 5

NH2 - NH2 acts as reducing agent & gives syn addition of H - atoms

Hydrocarbons - Question 6

Detailed Solution for Hydrocarbons - Question 6

 is a conjugated diene which gives 1,4-addition of H2

Hydrocarbons - Question 7

Detailed Solution for Hydrocarbons - Question 7

Halogen derivatives, in the presence of Na & dry ethetr gives W urtz reaction following free radical mechanism

Hydrocarbons - Question 8

 Major product :

Detailed Solution for Hydrocarbons - Question 8

Conc. H2SO4 is used as dehydrating agent for alcohols following carbocation mechanism Hence, it is associated with rearrangement.

Hydrocarbons - Question 9

The Major product the following reaction is :

 

Detailed Solution for Hydrocarbons - Question 9

A : Intramolecular W urtz reaction

Hydrocarbons - Question 10

Which of the following alkenes is most reactive towards electrophilic addition reaction?

Detailed Solution for Hydrocarbons - Question 10

Electroph ilic addition is favoured by nucleophilic nature of alkenes, (c) has 6α-H , which increases nu cleophilicity

Hydrocarbons - Question 11

Detailed Solution for Hydrocarbons - Question 11

-OCH3 has +R-effect, so, benzyl carbocation is more stable

Hydrocarbons - Question 12

Detailed Solution for Hydrocarbons - Question 12

Alkenes are more reactive than alkynes, but in vinylacetylene, HCl is added on alkyne as conjugated diene is formed which is more stable

Hydrocarbons - Question 13

Detailed Solution for Hydrocarbons - Question 13

NBS → free radical bromination    
KOH(alc) → Dehydro halogention
Hg(OAc)2 ,PhCH2OH → Mark. addition of alcohol

Hydrocarbons - Question 14

Detailed Solution for Hydrocarbons - Question 14

Exocylic π-bond is more reactive than endocyclic π-bond

Hydrocarbons - Question 15

Detailed Solution for Hydrocarbons - Question 15

Addition of Cl2+H2O is equivalent to HOCl, where Cl+ & OH- are added by Mark, rule 

Hydrocarbons - Question 16

Detailed Solution for Hydrocarbons - Question 16

Diborane gives anti-Mark addition of H & OH, where H belongs to diborane & OH from oxidation

Hydrocarbons - Question 17

Detailed Solution for Hydrocarbons - Question 17

HCHO acts as electrophile in the presence of H+ ion.

Hydrocarbons - Question 18

Detailed Solution for Hydrocarbons - Question 18

Reaction shows carbocationc rearrangement by H- shift

 

Hydrocarbons - Question 19

Rates of hydrohalogenation of the following alkenes are :




Detailed Solution for Hydrocarbons - Question 19

Hydrohalogenation follow electrophilic addition on nucleophilic alkene

Hydrocarbons - Question 20

 

C is 

Detailed Solution for Hydrocarbons - Question 20

Hydrocarbons - Question 21

Detailed Solution for Hydrocarbons - Question 21

Br2 forms cyclic halonium ion which reacts with lone pair of N.

 

Hydrocarbons - Question 22

Detailed Solution for Hydrocarbons - Question 22

Conjugated dienes give Diels-Alder reaction with alkenes, which is known as cyclo-addition or (4+2) addition. It involves syn addition

Hydrocarbons - Question 23

Which of the following compounds will show aromatic character?

Detailed Solution for Hydrocarbons - Question 23

Aromatic compounds are cyclic and planar following Huckel’s rule

Hydrocarbons - Question 24

Which of the following species is not aromatic?

Detailed Solution for Hydrocarbons - Question 24

It is anti-aromatic

Hydrocarbons - Question 25

Among the compounds the order of decreasing reactivity towards electrophilic substitution is :

Detailed Solution for Hydrocarbons - Question 25

_CH3 shows hyperconjugation, -OCH3 shows +R-effect & -CF3 shows inverse hyperconjugation

Hydrocarbons - Question 26

In the given reaction ;

Detailed Solution for Hydrocarbons - Question 26

-OH is +R & -COOH is -R, So, nitration is governed by -OH group

Hydrocarbons - Question 27

Detailed Solution for Hydrocarbons - Question 27

H2SO4 protonates isobutylene & ter. carbocation is formed where -OCH3 is +R substituent

Hydrocarbons - Question 28

compound C will be :

Detailed Solution for Hydrocarbons - Question 28

Hydrocarbons - Question 29

Detailed Solution for Hydrocarbons - Question 29



 

Hydrocarbons - Question 30

The major product formed in the reaction :

 

Detailed Solution for Hydrocarbons - Question 30

H3PO2 is a reducing agent, it reduces Ph N2+ benzene

Information about Hydrocarbons Page
In this test you can find the Exam questions for Hydrocarbons solved & explained in the simplest way possible. Besides giving Questions and answers for Hydrocarbons, EduRev gives you an ample number of Online tests for practice
Download as PDF
Download the FREE EduRev App
Track your progress, build streaks, highlight & save important lessons and more!