Tag: bonding in organic molecule

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Questions Related to bonding in organic molecule

Multiple choice chemistry introduction to organic chemistry bonding in organic molecule tetravalence of carbon: shapes of organic compounds introduction to carbon and its compounds

In which compound enol form is maximum

  1. $CH _3-\overset{\overset{O}{||}}C-CH _3$
  2. ${ CH } _{ 3 }-CH=O$
  3. ${ CH } _{ 3 }-\underset { || }{ C } -{ CH } _{ 2 }-CH _3\\ \quad \quad \quad O$
  4. ${ CH } _{ 3 }-{ CH _2 } -{ CH } _{ 3 }\\ \quad \quad \quad \quad $
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Enol content is higher in beta-dicarbonyl compounds due to intramolecular hydrogen bonding and resonance stabilization of the enol form. Option C is a beta-diketone.

Multiple choice chemistry introduction to organic chemistry bonding in organic molecule tetravalence of carbon: shapes of organic compounds introduction to carbon and its compounds

2 mole of ${ H } _{ 3 }{ PO } _{ 4 }$ has:

  1. Two $\pi $-bond
  2. Seven mole of $\sigma $-bond

  3. Sixteen lone pair of electron
  4. Fourteen mole of $\sigma $-bond
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

H3PO4 structure: P is double bonded to one O (1 pi bond) and single bonded to three OH groups. Total bonds: 3 P-O, 3 O-H, 1 P=O. Total sigma bonds = 3+3+1 = 7 per molecule. For 2 moles, 14 moles of sigma bonds.

Multiple choice chemistry introduction to organic chemistry bonding in organic molecule tetravalence of carbon: shapes of organic compounds introduction to carbon and its compounds

Geometry as sulphur is bent in 
I.${S} _{8}$ II.$S{F} _{2}$  III.$S{O} _{2}$

  1. I, II, III

  2. I, II

  3. II, III

  4. I, III
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

i. $S _8$ has rhombic shape.

ii.$SF _2$ has two lone pair and two particles geometry of $SF _2$ is bent or angular.
iii. $SO _2$ has one lone pair and $2$ oxygen molecules which gives bent geometry.

Multiple choice chemistry introduction to organic chemistry bonding in organic molecule tetravalence of carbon: shapes of organic compounds introduction to carbon and its compounds

The enthalpy of reaction,${\text{2HC}} \equiv {\text{CH + 5C}}{{\text{O}} _{\text{2}}}{\text{ + 2}}{{\text{H}} _{\text{2}}}{\text{O}}\,$
 If the bounds energies of ${\text{C - H,C}} \equiv {\text{C,}}\,{\text{O = O,C = O}}$ abd ${\text{O - H}}$ bounds are p,q,r,s,t respectively 

  1. $\left[ {8s + 4t} \right] - \left[ {4p + q + 5r} \right]$
  2. $\left[ {4p + 2q + 5r} \right] - \left[ {8s + 4t} \right]$
  3. $\left[ {4p + 2q + 5r + 8s + 4t} \right]$
  4. $\left[ {2q + q + 5r + } \right] - \left[ {8s + 4t} \right]$
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice chemistry introduction to organic chemistry bonding in organic molecule tetravalence of carbon: shapes of organic compounds introduction to carbon and its compounds

Which of the following is not correct?

  1. A sigma bond is weaker than pi bond.

  2. A sigma bond is stronger than pi bond.

  3. A double bond is stronger than a single bond.

  4. A double bond between two atoms is shorter than a single bond between the same atoms.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A sigma bond is stronger than a $\pi$ bond due to axial overlapping of the orbitals.

A double bond is stronger than a single bond since now more energy is required to break two bonds.
Double bonds are $sp^2$ hybridized and are shorter in length.
Hence, the correct option is A.

Multiple choice chemistry introduction to organic chemistry bonding in organic molecule tetravalence of carbon: shapes of organic compounds introduction to carbon and its compounds

Assertion: $\sigma$  is strong while $\pi$  is a weak bond.


Reason : Atoms rotate freely about  $\pi$  bond.

  1. Both assertion and reason are true, and reason is not the true
    explanation of the assertion.

  2. Both assertion and reason are true, but reason is the true
    explanation of the assertion.

  3. Assertion is true, but reason is false

  4. Both assertion and reason are false.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\sigma$ bond is stronger than $\pi$ bond because in $\sigma$ bond the overlap is axial while in $\pi$ bond. It is lateral.


Due to the lateral overlap in $\pi$ bond atoms cannot rotate freely in $\pi$ bond.
So, assertion is true and reason is false.