Chiral Centres and Chirality

Q.

What Are the Necessary Conditions for Optical Activity? Give an Example of Optically Active Compounds.

Q.

Molecules whose mirror image is non-superimposable over them are known as chiral. Which of the following molecules is chiral in nature?

(a) 2-bromobutane (b) 1-bromobutane

(3) 2-bromoprapane (d) 2-bromoprapane-2-ol

Q.

How many alcohol with molecular $C_4{H}_{10}O$ are chiral in nature?
(a) 1
(b) 2
(c) 3
(d) 4

Q.

Draw all the isomers (geometrical and optical) of:

(i) [CoCl₂(en)₂]⁺

(ii) [Co(NH₃)Cl(en)₂]²⁺

(iii) [Co(NH₃)₂Cl₂(en)]⁺

Q.

Do diastereomers have optical activity?

Q.

The name of the compound ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CHO}$ is

1. Propanal

2. Propanone

3. Ethanol

4. Ethanal

Q. Consider the following chemical reaction:
$CH\equiv CH\underset{\left(1\right)\text{Red hot}Fe\text{tube},873K}{\overset{\left(2\right)CO,HCl,AlC{l}_3}{\to }}Product$
The number of $s{p}^2$ hybridized carbon atom(s) present in the product is _____.

Q. How many optically active stereoisomers are possible for butane-$2,3$-diol?

1. $1$
2. $2$
3. $3$
4. $4$

Q.

What is the difference between structural and geometrical isomerism?

Q. Which of the following compound can show both optical and geometrical isomerism?

1. 
2. 
3. 
4. Both (a) and (c)

Q.

Which Of The Following Is A Configuration Definition File?

1. Manifests

2. Terraform

3. Openstalk

4. Cloud Formation

Q. How many cycloalkene isomers exist of $C_5{H}_8$ which contain at least one methyl locant directly present on the ring?

1. 7
2. 5
3. 4
4. 6

Q.

In which of the following molecules carbon atom marked with asterisk (*) is asymmetric?

(a) (i), (ii), (iii) and (iv) (b) (i) , (ii) and (iii)

(c) (ii), (iii) and (iv) (d) (i), (iii) and (iv)

Q. Which carbon is anomeric carbon in $\alpha -\text{Fructose}$?

1. $C_1$
2. $C_2$
3. $C_3$
4. $C_6$

Q. The formation of cyanohydrin from acetone is which type of reaction?

1. Nucelophilic addition reaction
2. Electrophilic substitution reaction
3. Electrophilic addition reaction
4. Nucelophilic substitution reaction

Q. The compound Bromochlorofluoromethane is:

1. Nonsuperimposable on its mirror image
2. Chiral
3. Optically active
4. The central Carbon atom is a chiral center

Q. Which of the following compounds is chiral?

1. 
2. 
3. 
4. 

Q. Which of the following compounds is/are chiral?

1. $1,2$-dichloropentane
2. $2,3$-dichloropentane
3. Both $A$ and $B$
4. $1,3$-chloropentane

Q. Which of the following compounds can have meso isomer?

1. 2, 3-dimethyl butane
2. All of these
   
   
3. 2, 3-butane diol
4. 2, 3-dibromo pentane

Q.

How do you know if a Stereoisomer is Optically Active?

Q.

What is a conjugate of a complex number?

Q. Which of the following(s) gives a tertiary alcohol on treating with excess of Grignard reagent?

1. $C{H}_{3}CHO$
2. $C{H}_{3}COC{H}_3$
3. $PhCOCl$
4. $PhCOOC{H}_3$

Q.

Which of the following does not have optical isomers?

1. $[\mathrm{Co}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2]\mathrm{Cl}$

2. $[\mathrm{Co}{\left(\mathrm{en}\right)}_3]{\mathrm{Cl}}_3$

3. $\left[\mathrm{Co}\right(\mathrm{en}){\left({\mathrm{NH}}_3\right)}_2{\mathrm{Cl}}_2]\mathrm{Cl}$

4. $[\mathrm{Co}{({\mathrm{NH}}_3)}_3{\mathrm{Cl}}_3]$

Q.

An organic compound contains two dissimilar asymmetric carbon atoms. The number of stereoisomers is:

1. 2
2. 3
3. 4
4. 1

Q. Types of stereoisomerism are optical isomerism and:

1. cis-isomerism
2. cis-trans isomerism
3. trans-isomerism
4. all of these

Q. Predict the product 'B'.

1. 
2. 
3. 
4. 

Q. The compound formed in the following reaction is called:

1. Vicinal diol
2. Geminal diol
3. Acetal
4. Ketal

Q.

Which is true about following?

1. Only I and II are chiral compounds

2. Only III is a chiral compound

3. Only II and IV are chiral compounds

4. All four are chiral compounds

Q. Predict the configuration of A and B at chiral carbon.

1. A- R; B-S
2. A- S; B-R
3. A- R; B-R
4. A- S; B-S

Q. Number of Chiral C-atoms in glucose and fructose are ___.

1. 4 in each
2. 3 in each
3. 4 in glucose and 3 in fructose
4. 3 in glucose and 4 in fructose