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(A) In ethers, bond angle C-O-C is more ...

(A) In ethers, bond angle C-O-C is more than tetrahedral angle
(R) Steric repulsive inter action between two bulky alkyl groups is more than 1p-lp repulsions around oxygen atom

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

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The correct Answer is:
A
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(A) The bond angle C-O-H in alcohol is less than in phenols (R) In phenols -OH group attached to the sp^2 carbon atom. While in alcohols OH group attached to sp^3 carbon atom

Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle between two methyl groups of n-butane in the gauche and anti forms are :

The geometry of a molecule depends upon the repulsions between electron pairs present in the valance shell of the central atom. LP - LP repulsions are greater than LP-BP which are greater than BP - BP. A pi bond can not decide the geometry of a molecule because pi bond has no independent exsistance. Deviations in bond angle are due to the presence of lone pairs. In which of the following orientation of electron pairs around the central atom is tetrahedral ?

An orbital is designated by certain values of first three quantum numbers (n, l and m) and according to Pauli.s exclusion principle, no two electrons in a atom can have all the for quantum numbers equal. N, l and m denote size, shape and orientation of the orbital. The permissible values of n are 1,2,3.... prop while that of 1 are all possible integral values from 0 to n-n. Orbitals with same values of n and 1 but different values of m (where m can have any integral values from 1 to +1 including zero) are of equal energy and are called degenerate orbitals. However degeneracy is destroyed in homogeneous external magnetic field due to different extent of interaction between the applied field and internal electronic magnet of different orbitals differing in orientations. In octahedral magnetic field external magnetic field as oriented along axes while in tetrahedral field the applied field actas more in between the axes than that on the axes themselves. For 1=0, 1,2,3,...., the states (called sub-shells) are denoted by the symbol s,p,d,f.....respectively. After f, the subshells are denoted by letters alphabetically 1 determines orbital angular motion (L) of electron as L = sqrt(l(l+1))(h)/(2pi) ON the other hand, m determines Z-component of orbital angular momentum as L_(Z) = m((h)/(2pi)) Hund.s rule states that in degenerate orbitals electrons do not pair up unless and until each each orbitals has got an electron with parallesl spins Besides orbital motion,an electron also posses spin-motion. Spin may be clockwise and anticloskwise. Both these spin motions are called two spins states of electrons characterized by spin Q.N (s) : s = +(1)/(2) and = -(1)/(2) respectively The sum of spin Q.N. of all the electrons is called total spin(s) and 2s+1 is called spin multiplicity of the configuration as a whole. The spin angular momentum of an electron is written as L_(s) = sqrt(s(s+1))(h)/(2pi) The orbital angular momentum of electron (l=1) makes an angles of 45^(@) from Z-axis. The L_(z) of electron will be

An orbital is designated by certain values of first three quantum numbers (n, l and m) and according to Pauli.s exclusion principle, no two electrons in a atom can have all the for quantum numbers equal. N, l and m denote size, shape and orientation of the orbital. The permissible values of n are 1,2,3.... prop while that of 1 are all possible integral values from 0 to n-n. Orbitals with same values of n and 1 but different values of m (where m can have any integral values from 1 to +1 including zero) are of equal energy and are called degenerate orbitals. However degeneracy is destroyed in homogeneous external magnetic field due to different extent of interaction between the applied field and internal electronic magnet of different orbitals differing in orientations. In octahedral magnetic field external magnetic field as oriented along axes while in tetrahedral field the applied field actas more in between the axes than that on the axes themselves. For 1=0, 1,2,3,...., the states (called sub-shells) are denoted by the symbol s,p,d,f.....respectively. After f, the subshells are denoted by letters alphabetically 1 determines orbital angular motion (L) of electron as L = sqrt(l(l+1))(h)/(2pi) ON the other hand, m determines Z-component of orbital angular momentum as L_(Z) = m((h)/(2pi)) Hund.s rule states that in degenerate orbitals electrons do not pair up unless and until each each orbitals has got an electron with parallesl spins Besides orbital motion,an electron also posses spin-motion. Spin may be clockwise and anticloskwise. Both these spin motions are called two spins states of electrons characterized by spin Q.N (s) : s = +(1)/(2) and = -(1)/(2) respectively The sum of spin Q.N. of all the electrons is called total spin(s) and 2s+1 is called spin multiplicity of the configuration as a whole. The spin angular momentum of an electron is written as L_(s) = sqrt(s(s+1))(h)/(2pi) According to Hund.s rule, the distribution of electron within the various orbitals of a given sub-shell is one which is associated with

(A) Benzaldehyde is more reactive than acetaldehyde towards nucleophilic attack. (R) The combined effect of -I and +R effects of phenyl group decreases the electron density on the carbon atom of C=O group in benzaldehyde.

(A): CH_(3) = overset(oplus)(C )- underset(..)overset(..)(O) is more stable than CH_(3) - C -= ""^(oplus)O: (R ): Resonance structure in which all the atoms obey octet rule is more stable than resoance structure in which all atoms are not obeying octet rule

Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle in staggered (gauche) and eclipsed conformation are:

AAKASH SERIES-ALCOHOLS, PHENOLS AND ETHERS-ETHERS (OBJECTIVE EXERCISE-4)
  1. (A) Reactivity of primary alcohol is more than secondary alcohols towa...

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  2. (A) The bond angle C-O-H in alcohol is less than in phenols (R) I...

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  3. (A) In ethers, bond angle C-O-C is more than tetrahedral angle (R...

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  4. (A) n-propyl alcohol is prepared from propene by the action of B2H6 f...

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  5. (A) During acid catalysed esterification, oxygen atom of alcohol is pr...

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  6. (A) Lucas reagent is used to distinguish 1^@ , 2^@ and 36@ alcohols ...

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  7. (A) Addition of water to (CH3)2 - C = CH - CH3 gives (CH3)2 - COH - C...

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  8. (A) 1-propanol & 2-propanol can be distinguished by haloform test ...

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  9. (A) Alcohols are acidic in nature but donot react with NaOH solution ...

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  10. (A) The acidity of alcohols follow the order 1^@ gt 2^@ gt 3^@ (R...

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  11. (A) For the reduction of esters in to alcohols Ni//H2 is preferred tha...

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  12. (A) Dichloro carbene acts as electrophile in Reimer-Tiemann reaction. ...

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  13. (A) : Phenols are more acidic than alcohols. (R): Phenoxide ion is m...

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  14. (A) In methanol C-O bond length is 1.42Å, but in phenol, it is 1.36Å. ...

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  15. (A) o-Nitrophenol is less soluble in water than the m- and p-isomers o...

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  16. (A) Phenol undergoes Kolbe's reaction but not ethanol. (R) Phenox...

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  17. (A) Phenols are acidic & react with alkalies like NaOH but do not reac...

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  18. (A) Presence of electron withdrawing groups at p-position, increases t...

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  19. (A) Both phenol and phenoxide ion exhibit resonance, phenoxide ion is ...

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  20. (A) Phenol and benzoic acid are distinguished with NaHCO3 solution ...

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