Conformations of Cyclohexane
Trending Questions
Q. In compounds of type ECl3, where E=B, P, As or Bi, the Cl−E−Cl bond angles for different E are in the order:
- B>P=As=Bi
- B>P>As>Bi
- B<P=As=Bi
- B<P<As<Bi
Q. Among the structures shown below, which one has the lowest potential energy?
Q. Which of the following is correct regarding diborane (B2H6) ?
- It has three centred two electron bond
- Terminal H−B−H bond angle is 90∘
- Both Boron atoms are sp2 hybridised
- All hydrogens in B2H6 lie in the same plane
Q. Are the cyclohexane conformations not planar? If yes, why?
- Because for a planar structure bond angle would be 120o, too large for sp3 hybrid orbitals.
- Because for a planar structure bond angle would be 120o, too small for sp3 hybrid orbitals.
- They are planar.
- Because sp3 hybrid orbitals need 120o bond angle and cyclohexane planar structure has 90o
Q. What is the hybridization of phosphine?
- sp2 hybridized
- sp3 hybridized
- sp hybridized
- No hybridization
Q. In which of the following compounds, all the bond angles are exactly 109∘28′
- Chloromethane
- Iodoform
- Carbon tetrachloride
- Chloroform
Q. The correct conformation of the following compound is:
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/616143/original_7.ques.png)
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/616143/original_7.ques.png)
Q. Calorific value of ethane in KJ/g if for the reaction 2C2H6 + 7O2 ---- 4CO2 + 6H20; H= -745.6 kcal 1) -12.4 2) -24.7 3) -52 4) 104
Q. 1, 3 Butadiene on reaction with HBr/water gives primarily 3 bromo 1 butene at high temperatures. Give the reaction.
Q. The degree of unsaturation in the given compound is:
1) C3H3Cl3
2) C3H4O
3) C4H5N
1) C3H3Cl3
2) C3H4O
3) C4H5N
- 2, 1, 3
- 1, 2, 3
- 3, 2, 1
- 2, 3, 1
Q.
From chair, boat, half-chair, and twist, the least stable conformer of cyclohexane is:
Half chair
Boat
Chair
Twist
Q. Boat form of cyclohexane is less stable than chair form because:
- it floats on water
- of interaction of flag pole H on top of carbon
- of high dipole moment
- none of the above
Q. Sort the following cyclohexane conformations according to stability.
- Half Chair form
- Chair form
- Twist Boat form
- Boat form
Q.
The order of stability of cyclohexane conformations is :
Chair > twist boat > boat > half chair
twist boat > chair > boat > half chair
boat > twist boat > chair > half chair
Chair > half chair > boat > twist boat
Q. The species having bond angles of 120∘ is
- PH3
- ClF3
- NCl3
- BCl3
Q. Statement-I: The potential energy barrier for rotation about the C=C bond in 2-butene is much higher than that in ethylene.
Statement-II: Hyperconjugation effect decreases the double bond character.
Statement-II: Hyperconjugation effect decreases the double bond character.
- Statement-I is True, Statement-II is True ; Statement-II is a correct explanation for Statement-I
- Statement-I is True, Statement-II is True ; Statement-II is NOT a correct explanation for Statement-I
- Statement-I is True, Statement-II is False
- Statement-I is False, Statement-II is True
Q. Glycerine is more viscous than ethylene glycol.
- True
- False
Q. Which of the following are known conformations of cyclohexane?
- Chair
- Half-chair
- Boat
- Twist Boat
Q. Which is more stable and why?
![1087915_dbe51d7bd01d404787d18f8518956bdc.png](https://search-static.byjusweb.com/question-images/toppr_invalid/questions/1087915_dbe51d7bd01d404787d18f8518956bdc.png)
![1087915_dbe51d7bd01d404787d18f8518956bdc.png](https://search-static.byjusweb.com/question-images/toppr_invalid/questions/1087915_dbe51d7bd01d404787d18f8518956bdc.png)
Q. Match compounds (in List I) with the specific properties of the compounds (in List II).
Q. Which of the following statement is correct about alkyl halides?
- They dissolve in water quickly.
- They are associated with each other by H-bonds.
- They dissolve easily in organic solvents.
- They do not contain any polar bonds in their molecules.
Q. Consider the following transformations:
(I) XeF6+NaF→Na+[XeF7]−
(II) 2PCl5(s)→[PCl4]+[PCl6]−
(III) [Al(H2O)6]3++H2O→[Al(H2O)5OH]2++H3O+
Correct transformations are :
(I) XeF6+NaF→Na+[XeF7]−
(II) 2PCl5(s)→[PCl4]+[PCl6]−
(III) [Al(H2O)6]3++H2O→[Al(H2O)5OH]2++H3O+
Correct transformations are :
- I, II, III
- II, III
- I, III
- I, II
Q. Number of 90∘ bond angle (s) in PCI5 molecule is
Q. Decreasing −I effect of the given group is :
(a) −CN (b) NO2 (c)−NH2 (d) −F
(a) −CN (b) NO2 (c)−NH2 (d) −F
- b>a>d>c
- c>b>d>a
- c>b>a>d
- b>c>d>a
Q. Which of the following statements are false?
- Glucose is the only aldose that mutarotates
- Ketose also mutarotates
- Glycosides mutarotates
- There is a relationship between the ability of a sugar to mutarotate and to reduce Tollens or Fehling's reagents
Q. Which of the following is the least stable conformer of cyclohexane?