Practice free Basic Principles of Orgainc Chemistry (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
A reagent suitable for the determinatin of N-terminal residue of a peptide is
(d) 2,4-dinitro fluorobenzene is called Sanger's reagent. When this reagent reacts with amino group of peptide chain, it form 2,4-dinitrophenyl derivatives which on hydrolysis form DNP derivatives of amino acids.
The dihedral angle between two C-H bonds in the staggered conformation of ethane is
Isomers of a substance must have the same
(d) Two or more compounds having the same molecular but different physical, chemical properties and structural formula are called isomers.
But-2-ene exhibits cis-trans-isomerism due to
Due to presence of >C=C< in butene-2, it shows restricted rotation. Hence, give two types of arrangements around the space of >C=C< as cis and trans-forms.
How many stereoisomers does this molecule have?
CH3CH=CHCH2CHBrCH3
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:
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.
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