Eclipsed Conformation

Q. all the four sigma bond in perchlorate io are sp3-sp3 or sp2-sp

Q.

In compound X, all the bond angles are exactly ${109}^{o}28\text{'}$, X is

1. Iodoform

2. Chloromethane

3. Carbon tetrachloride

4. Chloroform

Q. What is the dihedral angle in eclipsed conformation of ethane molecule?

1. $0^{\circ }$
2. ${60}^{\circ }$
3. ${120}^{\circ }$
4. ${90}^{\circ }$

Q. A : Dueto higher electronegatuvity of N, O and F, the magnitude ofH bonding is quite appreciable in their hydrides.R: the boiling points ofNH3 h2O andHF are higher than the hydrides of he subsequent group members.

Q. Torsional strain in eclipsed conformations of a molecule is due to:

1. Repulsion between the eclipsed carbons
2. Repulsion between aligned electron pairs of the eclipsed bond
3. Repulsions between aligned 'H'
4. None of the above

Q. The rotational energy barrier $in{\text{K cal mol}}^{-1}$ between the most stable and the least stable conformations of $\text{2, 3- dimethylbutane}$ along $C_2-C_3$ bond is :
(Given : Energies ${\text{K cal mol}}^{-1}$ for $H/C{H}_3$ eclipsing = $1.8$, $C{H}_3/C{H}_3$ eclipsing = $3.9$, $C{H}_3/C{H}_3$ gauche = $0.9$. Torsional strain of $H/H$ eclipsing is neglected.)

Q. Choose the correct statement for the following newman projection :

1. It is an eclipsed conformation.
2. It is a staggered conformation.
3. It is a skew conformation.
4. All of the above.

Q. The maximum number of 90° angle between bond pair bond pair of electrons is observed in Sp3d2 hybridisation Sp3 hybridisation Sp3d hybridisation Dsp2 hybridisation

Q. Dihedral angle of least stable conformer of ethane is:

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1. $0^o$
2. ${120}^o$
3. ${60}^o$
4. ${180}^o$