Which pair of the following carbonyl compounds can be diifferentiated by I2/NaOH?
C6H5-CHO and C6H5-CO-CH2-CH3
C6H5-CO-CH3 and CH3-CH2-CO-CH3
CH3-CH2-CO-CH2-CH3 and C6H5COCH2CH3
C6H5-CO-CH(CH3)-CH3 and C6H5-CO-CH3
In the reaction sequence,
CH3CN . The products [A] and [B] are
(CH3)3COH, (CH3)2C=CH2
(CH3)2CHOH, CH3CH=CH2
CH3COCH3, CH3CH=CH2
In the carbylamine reaction, R-X is converted to R-Y via the intermediate Z. R-X, R-Y and Z, respectively, are
RNH2, RNC, Carbene
RNH2, RNC, nitrene
RNC, RNH2, carbene
ROH, RNC, nitrene
Which of the following statements is true?
Denaturation of protein changes the primary structure of protein
All proteins act as biocatalyst
C-terminal amino acid in proteins is determined by Edman degradation
The pleated sheet structure of proteins was determined by Pauling
D.
The pleated sheet structure of proteins was determined by Pauling
All proteins are not biocatalysts. Denaturation of proteins affects only secondary and tertiary structures. The most commonly used method for determining the C-terminal amino acid residue in a protein is hydrazinolysis. In this method, protein is treated with anhydrous hydrazine at 373 K when all amino acid residues except C-terminal one is converted into amino acid hydrazides. The mixture of products is subjected to chromatography. On elution the strongly basic hydrazides are retained, but the free amino acid is eluted. By identifying the free amino acid the C-terminal amino acid residue of a protein can be determined.
The first β-pleated sheet structure was proposed by ω. Astburry while a refined
version was proposed by Linus pauling and Robert corey.
Which one of the following is the strongest base ?
2,4,6-trinitroaniline
2,4,6-trinitro-N,N-dimethyl aniline
N, N-dimethyl aniline
Anline
The given reaction is called as
Schmidt rearrangement
Curtius rearrangement
Hofmann rearrangement
Lossen rearrangement
The boiling points of three isomeric pentanes 1, 2 and 3 are
(1) 9.5°C
(2) 28°C
(3) 36°C
1, 2 and 3 are respectively
n-pentane, iso-pentane, neo-pentane
iso-pentane, neo-pentane, n-pentane
n-pentane, neo-pentane, iso-pentane
neo-pentane, iso-pentane, n-pentane