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Organic Chemistry Multiple Choice Questions and Answers – Alkadienes

Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) Identify the incorrect statement regarding alkadiene.
[A] These are acyclic acids
[B] These are unsaturated hydrocarbons
[C] These compounds have only one C=C bonds
[D] These compounds have the general formula CnH2n-2
Answer: These compounds have only one C=C bonds
(2) Alkadienes are classified into how many types?
[A] 1
[B] 2
[C] 3
[D] 4
Answer: 3
(3) Identify the incorrect statement regarding conjugated double bonds in alkadiene.
[A] 1,3 alkadienes have conjugated double bond
[B] Compounds with a double bond exhibit this type of bond
[C] 1,3 pentadiene is an example for this bond
[D] The conjugated dienes have properties similar to that of alkenes
Answer: Compounds with a double bond exhibit this type of bond
(4) Identify the one which is the perfect example for Isolated double bond?
[A] 1,4 pentadiene
[B] 1,2 pentadiene
[C] 1,3 pentadiene
[D] 1,5 butadiene
Answer: 1,4 pentadiene
(5) Identify the incorrect statement regarding alkadienes.
[A] Dienes show cis-trans isomerism
[B] Conjugated dienes have better stability compared to other dienes
[C] Dienophile supports alkadienes
[D] Alkadienes also undergo hydrobromination
Answer: Dienophile supports alkadienes
(6) Conjugated diene reacts with which among the following to form a cyclohexene?
[A] Phenol
[B] Dienophile
[C] Hexane
[D] Tribromo phenol
Answer: Dienophile
(7) Which among the following dienes undergo addition with the help of radical-chain mechanism?
[A] Cumulated dienes
[B] Isolated dienes
[C] Simple dienes
[D] Conjugated dienes
Answer: Conjugated dienes
(8) Identify the statement which is related to Diels-Alder reaction?
[A] It is very stereospecific
[B] Molecular distortion takes place
[C] Cyclic dienes react very slow than the linear chain dienes
[D] Addition of maleic anhydride to cyclopentadiene causes diene and dienophile to produce different products
Answer: Cyclic dienes react very slow than the linear chain dienes
(9) A molecule in which more than one single bond separates two double bonds are called as ____________
[A] Coordinate bond
[B] Isolated double bond
[C] Cumulative double bond
[D] Conjugated double bond
Answer: Isolated double bond
(10) Isolated dienes are similar in property to ______________
[A] Monoolefins
[B] Diolefins
[C] Triolefins
[D] Tetraolefins
Answer: Monoolefins
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