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Test: Alkanes : Preperation and Projections - JEE MCQ


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20 Questions MCQ Test Chemistry for JEE Main & Advanced - Test: Alkanes : Preperation and Projections

Test: Alkanes : Preperation and Projections for JEE 2024 is part of Chemistry for JEE Main & Advanced preparation. The Test: Alkanes : Preperation and Projections questions and answers have been prepared according to the JEE exam syllabus.The Test: Alkanes : Preperation and Projections MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Alkanes : Preperation and Projections below.
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Test: Alkanes : Preperation and Projections - Question 1

The end product (C) in the following sequence of reactions is

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Test: Alkanes : Preperation and Projections - Question 2

Predict the product 'B' in the sequence of reactions

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Test: Alkanes : Preperation and Projections - Question 3

One mole of alkene X on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of X is

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To decide the structure of alkene that undergoes ozonolysis, bring the products together in such a way that O atoms are face to face, and replace O by double (=) bond. Thus,

Test: Alkanes : Preperation and Projections - Question 4


is

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C = O is (EWG) hence π electron transfer is onwards ring.

Test: Alkanes : Preperation and Projections - Question 5

An alkene having molecular formula C7H14 was subjected to ozonolysis in the presence of zinc dust. An equimolar amount of the following two compounds was obtained

The IUPAC name of the alkene is

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Test: Alkanes : Preperation and Projections - Question 6

Which of the following will yield a mixture of 2-chlorobutene and 3-chlorobutene on treatment with HCl?

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Test: Alkanes : Preperation and Projections - Question 7

Which of the following statements is incorrect regarding dehydrohalogenation of alkenes?

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Nature of halogen atom and the alkyl group both determine rate of reaction.

Test: Alkanes : Preperation and Projections - Question 8

Predict the product (A) of the following reaction

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Test: Alkanes : Preperation and Projections - Question 9

Which of the following alkenes will yield 2-methyl propanal on reductive ozonolysis. (addition with ozone followed by the reaction with Zn/H2O ).

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2,5 dimethyl hex -3-ene on reductive ozonolysis in presence of O3 and Zn/H2O, gives 2 moles of 2-methyl propanal.

Hence, the correct option is (c).

Test: Alkanes : Preperation and Projections - Question 10

Which one of the following compounds would have the highest heat of hydrogenation?

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The heat of hydrogenation of an alkene depends upon its stability. Higher the stability, lower the heat of hydrogenation. Since CH2 = CH2 has no substituent, it is the least stable alkene and hence has the highest heat of hydrogenation

Test: Alkanes : Preperation and Projections - Question 11

Which of the following types of reaction occur when a reactant has got a double bond ?
(i) Addition
(ii) Photolysis
(iii) Nucleophilic substitution
(iv) Polymerization

Detailed Solution for Test: Alkanes : Preperation and Projections - Question 11

Addition reaction occurs on a double bond. The compound containing double bonds are also undergo polymerisation. So, the correct option are both (i) and (iv) e.g.

(addition reaction)

Test: Alkanes : Preperation and Projections - Question 12

HOCl reacts on 3 -methyl-2-pentene, the main product will be :

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When 3-methyl-2-pentene is reacted with hypochlorous acid, the product formed is 2 -chloro-3-methyl pentanol-
3 The reaction obeys Markovnikov's addition and the hydroxide and chloro group is added across the double bond of two carbons.
We can write the reaction of 3 -methyl-2-pentene with HOCl as,

Test: Alkanes : Preperation and Projections - Question 13

In the following reaction, A and B respectively are

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Test: Alkanes : Preperation and Projections - Question 14

Ethylene can be prepared in good yield by

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This is an example of Hofmann elimination which generally takes place by E2 mechanism and the latter requires a strong base (recall that OH- is a strong base than I-). The NH2-, being a strong base can't be eliminiated easily.

Test: Alkanes : Preperation and Projections - Question 15

In the following reaction, compound (B) is

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Test: Alkanes : Preperation and Projections - Question 16

In the dehydration of,


The product formed are

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Test: Alkanes : Preperation and Projections - Question 17

Which of the following wil have least hindered rotation about carbon carbon bond?

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Free rotation around carbon-carbon bond takes place easily in alkanes. Now ethane and hexachloroethane both are alkanes, but in hexachloroethane bulky chlorine atom is present while ethane is least hindered.

Test: Alkanes : Preperation and Projections - Question 18
Which of the following is a free radical substitution reaction ?
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Test: Alkanes : Preperation and Projections - Question 19

Select major product

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OsO4 results in syn addition of 2 "OH" group.

Test: Alkanes : Preperation and Projections - Question 20

A & B are respectively

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Dihydroxylation reaction of alkene.

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