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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-HALOALKANES AND HALOARENES-Competition Focus (JEE (MAIN AND ADVANCED)/MEDICAL ENTRANCE SPECIAL (MULTIPLE CHOICE QUESTIONS - I))
  1. (CH(3))(3)CMgBr on reaction with D(2)O produces :

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  2. The products expected to be formed in the Wurtz reaction of a mixture ...

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

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  4. 1-bromo-3-chlorocyclobutane when treated with two equivalents of Na, i...

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  5. Two possible stereo-structures of CH(3)CHOHCOOH, which are optically a...

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  6. Which of the following compounds is chiral? .

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  7. How many chiral compounds are possible on mono chlorination of 2-methy...

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  8. Out of the following the alkene that exhibits optical isomerism is

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  9. The total number of optical isomers possible for 2,3-dibrom https://d1...

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  10. How many stereoisomerse does this molecule has? CH(3)CH=CHCH(2)CHBrC...

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  11. In a mixture, two enantiomers are found to be present in 85% and 15% r...

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  12. A solution of ( + )-1-chloro-1-phenylethane in t toluene racemises slo...

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  13. ltBrgt Give the number of N and M?

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  14. The absolute configuration of

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  15. Which of the following biphynyl is optically active?

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  16. The product of the above reaction is

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  17. The structure of the major product formed in the following reaction is

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  18. Bottles containing C(6)H(5)I and C(6)H(5)-CH(2)I lost their original l...

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  19. The correct order of increasing reactivity of C-X bond towards nucleop...

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  20. Which of the following compounds undergoes mucleophilic substitution r...

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