Optical Activity

Q. 15.The equilibrium constant Kp for the thermal dissociation of PCl5 at 200 degree celcius is 1.5 atm. The pressure in atm at which it is 50% dissociated at that temperature is A)4.8 B) 4.5 C)3.2 D)2.4

Q. 88 What are the structural isomers of hexane ? Also draw their electron-dot structure.?

Q. (+) Mandelic acid has a specific rotation of $+{158}^{\circ }$ what would be the observed specific rotation of a mixture of 25 $\%$ (-) mandelic acid and 75 (+) mandelic acid ?

1. -118.5°

2. - 79°

3. +79°

4. + 118.5°

Q. Ketones have 2 alkyl groups attached to carbonyl carbon while aldehydes have one alkyl group. Alkyl groups decrease polarity. In this case how are ketones more polar than aldehydes?

Q.

Reason for geometrical isomerism by 2-butene is:

1. Chiral carbon

2. Free rotation about single bond.

3. Free rotation about double bond.

4. Restricted rotation about double bond.

Q.

Which of the following are ring-chain isomers?

1. 

2. 

3. 

4. 

Q.

Empirical formula of Two-dimensional sheet silicates is:

1. 

2. 

3. 

4. 

Q. what is the total number of elements of symmetry in a cubic crystal? how to find out for any other crystal?

Q. 71 Steric inhibition of resonance can affect dipole moment of an organic compound.Explain how this happens?

Q. in benzene how many pi electron are their ?

Q.

$Ca{C}_2\stackrel{H_{2}O}{\to }A\underset{H{g}^{2+}}{\overset{H^{+}}{\to }}\left[B\right]\to C$. If 'B' is an unstable compund. The relation between 'B' and 'C' is

1. Tautomers

2. Position isomers

3. Geometrical isomers

4. Metamers

Q. In the conversion of I2 IO3–, the oxidation state of iodine changes from o to +5 give reason

Q.
The number of stereoisomers which can be possible for the given compound will be?

1. 6
2. 8
3. 9
4. 16

Q. Why does carbon form tetrahalide while lead forms dihalide

Q. which one has the highest boiling point and why
2-methylpentane
2, 3-dimethylbutane
2, 2-dimethylbutane

Q. For the given reaction of monobromination of a compound, how many products are optically active (all isomers) :

Q. 2-Butanol having an observed rotation of +9.72 has the rotation for the pure enantiomer calculated as +13.5
Then choose the correct option(s):

1. Total (-) isomer is 14%
2. Total (-) isomer is 36%
3. Racemic mixture is 72%
4. Racemic mixture is 28%

Q. 16. how around a carbon atom bond forms with another carbon as tetrahedral manner

Q.

explain alkanoic acid?

Q. Ketones have 2 alkyl groups attached to carbonyl carbon while aldehydes have one alkyl group. Alkyl groups decrease polarity. In this case how are ketones more polar than aldehydes?