NEET Chemistry Questions: Basic Principles of Orgainc Chemistry

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How many stereoisomers does this molecule have?           

CH3CH=CHCH2CHBrCH3





No explanation available.

Rotation of plane polarized light can be measured by:





A polarimeter is an instrument used to measure the rotation of plane-polarized light by an optically active substance. It is commonly used to determine the concentration of optically active compounds in solution.

Which one of the following can exhibit cis-trans-isomerism?





(c) The main conditions for geometrical isomerism are

(i) The molecule must have a double bond and the double bond gives restricted rotation

(ii) The two atoms or groups attached to the same carbon atom must be different.

These two conditions are only obeyed by Cl-CH=CH-Cl, so it shows geometrical isomerism.

Geometrical isomers differ in





(c) Geometrical isomers :- The isomers having same molecular formula but differ in the position of atoms or groups in space due to hindered rotation about a double bond, are known as geometrical isomers.

Fisher projection indicates:





No explanation available.

Which of the following compounds is not chiral ?





(a) Chiral carbon is that carbon whose all the four valencies are satisfied by four different groups. Due to absence of asymmetric (chiral) C-atom

D-CH2-CH2-CH2Cl molecule is not a chiral molecule.

The  most important chemical method to resolve a racemic mixture makes use of the formation of    





(c) Diastereomers have different physical properties such as melting point, boiling point, solubilities in a given solvent, densities, refractive index, etc. Because of the differences in the boiling points and the solubilities, they can be separated by fractional crystallization.

Which pair represents chain isomers?





Chain isomers are those compounds in which the number of carbon atoms present in the main chain are differ 

Which of the following is an optically active compound?        





No explanation available.

The number of stereo isomers for 3-pentene 2-ol





3-pentene-2-ol has two chiral carbon atoms, and each chiral carbon atom can have two different orientations (R or S). Therefore, the total number of stereoisomers is 2^2 = 4.

The most stable configuration of n-butane will be                





The most stable configuration of n-butane is the staggered-anti conformation, where the carbon atoms are arranged in a zig-zag pattern, minimizing the steric hindrance and maximizing the stability.

The compound having molecular formula C4H10O can show:





 (d) Alcohols show position isomerism; Ethers show metamerism; Alcohols and ethers show functional isomerism.         

Which of the following will not show cis-trans-isomerism?                           





(c) CH3-C|=CH-CH2-CH3           CH3 will not show cis-trans isomerism because double bonded carbon atom have two same groups (-CH3, methyl group)

An alkane forms isomers if the number of carbon atoms is:





(d) Butane and isobutane and all higher alkanes show isomerism. 

Isomerism exhibited by acetic acid and methyl formate is:





(a) Acid has -COOH group whereas, ester has -COOR group.