7) Some alkenes have geometric (cis-trans) isomers because A) the carbon atoms i

Question

7) Some alkenes have geometric (cis-trans) isomers because A) the carbon atoms in the double bond cannot rotate B) each of the carbon atoas in the double bond has four different groups attached to it C) one of the carbon atoms in the double bond has two identical groups attached to D) the carbon atoms in the double bond are free to rotate E) all of the carbon atoms in the compound are rigid and cannot rotate The hydrogenation of an alkene gives a(n) A alkane )alkene C) alkyne D) benzene E) isomer 9) What is the product of the reaction shown below? A) OH OH CH3 -CH2-CH-CH2 B) OH CH3-CH2-cH-CH C) CH3-CH2-CH2-CH2 OH D) OH OH CH3-CH-cH-CH3 E) OH CH3-CH2-c-CH2 10) Which of the compounds below is aromatic? A) CH2-CH-C-CH2 C) B) CH3-C-CH2 E) D)

Explanation / Answer

7. Answer is Option A.

Carbon atom in the double bond cannot rotate, therefore cis and trans isomer is generated.

8. Answer is option A.

Alkane

Reason: the unsaturated compound is converted to saturated compound by reduction double to single bond.

9. Answer is option B.

Reason:

Initially hydrogen is added to terminal alkene to form stable secondary carbocation later hydroxy group is added to form option B. as product

10. Answer is option E.

Reason: the compound to be aromatic it want to satisfy huckel rule of 4n+2 ok electrons, in the options only benzene will satisfy huckel rule where n=1

15.answer is option C.

Phenol

Reason : phenol is acidic because the phenoxide ion is formed is after losing proton from phenol is more stable due resonance.

16. Answer is option B.

Hydrogen bonding

Reason: hydrogen bonding is formed when hydrogen is between two electronegative atom it is possible in methanol and water.

17. Answer is option C.

tertiary

Reason :

Tertiary alcohol is hydroxy group attached carbon must be attached to three alkyl group.

18. Answer is option C.

Alcohol, ether and ketone

19. Answer is option B.

Alkene

Reason: dehyration is process by which water is removed from molecule by removing hydroxy group and proton.

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