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Cycloalkane formed when 1,4-dibromopenta...

Cycloalkane formed when 1,4-dibromopentane is heated with sodium is:

A

methylcyclobutane

B

cyclopentane

C

cyclobutane

D

methylcyclopentane

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The correct Answer is:
A
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(a) When cis-2,3-dibromopent-2-ene is hydrogenated with H_2//Pt , The product is : (i) Meso-2,3 -Dibromopentane (ii) (+)2,3 -Dibromopentane (iii) (-)2,3 -Dibromopentane (iv) (+-)2,3 -Dibromopentane (b) When trans-2,3-dibromopentane-2-ene is hydrogenated with H_2//Pt . The product is : (i) Meso-2,3 -Dibromopentane (ii) (+)2,3 -Dibromopentane (iii) (-)2,3 -Dibromopentane (iv) (+-)2,3 -Dibromopentane (c) When cis-2,3 -dibromopent-2-ene is hydrogenated with Birch reduction. The product is : (i) Meso-2,3-dibromopentane (ii) (+)2,3 -Dibromopentane (iii) (-)2,3- Dibromopentane (iv) (+-)2,3 -Dibromopentane (d) When trans-2,3-dibromopent-2-ene is hydrogenated with Na + liq. NH_3 + ethanol. The product is : (i) Meso-2,3-dibromopentane (ii) (+)2,3 -Dibromopentane (iii) (-)2,3 -Dibromopentane (iv) (+-)2,3 -Dibromopentane (e) When 2-butyne is reduced with Lindlar's catalyst. The product is : (i) cis-2-Butene (ii) trans-2-Butene (iii) Both (i) and (ii) (iv) None (f) When 2-Butyne is reacted with Na + liq. NH_3 + C_2H_5 OH . The product is : (i) cis-2-Butene (ii) trans-2-Butene (iii) Both (i) and (ii) (iv) None.

PRADEEP-HYDROCARBONS-Competition Focus (JEE(main and advanced)/Medical Entrance) I. MULTIPLE CHOICE QUESTIONS
  1. An alkyl bromide (X) reacts with sodium in ether to form 4,5-diethyloc...

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  2. Hydrocarbon (A) reacts with bromine by substitution to form an alkyl b...

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  3. Cycloalkane formed when 1,4-dibromopentane is heated with sodium is:

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  4. What would be the produt formed when 1-bromo-3 chorocyclobutane reacts...

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  5. An alkane C(7)H(16) is produced by the reaction of lithium di (3-"Pent...

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  6. The best method for the preparation of 2,2-dimethylbutane is via the r...

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  7. Which of the following reactions is not correct for preparation of alk...

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  8. Wurtz reaction of methyl iodide yields an organic compound X. Which on...

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  9. Electrolysis of a concentrated aqueous solution of a compound gave C2H...

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  10. For preparing an alkane , a concentrated aqueous solution of sodium or...

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  11. The correct order of boiling points of 2, 2-dimethylpropane, 2 methylb...

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  12. Isomers of hexane, based on their branching , can be divided into thre...

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  13. In which of the following, homolytic bond fission takes place :

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  14. Methane can be converted into ethane by the reactions

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  15. The total number of monohalogenated products formed by halogenation o...

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  16. Which branched chain isomer of the hydrocarbon with molecular mass 72m...

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  17. Of the five isomeric hexanes, the isomer which can give two monochlori...

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  18. Of the isomeric haexanes, the isomers that give the minimum and maximu...

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  19. Which of the following isomeric heptanes can yield seven different mon...

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  20. Consider the following reaction , H3C-undersetundersetD|CH-undersetund...

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