Detection of sulphur in sodium extract (Lassaigne test) is not done by which of the following reagents?
Pb(OAc)2
Sodium nitroprusside
Both Pb(OAc)2 and Sodium nitroprusside
Silver nitrate
Which of the following orders is not correct regarding the -I effect of the substituents?
—SR < —OR <—O+R2
—N+R2 < —OR<—F
—I< —Cl <—Br < —F
—N+R3<—O+R2 <—OR
Which of the following types of reaction occurs when a substituent has got a double bond with evenly distributed π-electron cloud?
Electrophilic addition
Nucleophilic addition
Electrophilic substitution
Nucleophilic substitution
An organic compound C3H5Cl (A) when treated with magnesium in dry ether gives (B) which on treating with CO2 followed by acid hydrolysis gives C4H6O2 (C). (C) is also obtained on oxidation of a hydrocarbon (D) C8H12. Structure of A is
CH2=CH-CH2-Cl
CH2=C(Cl)-CH3
CH(Cl)=CH-CH3
A compound contains two dissimilar asymmetric C-atoms. The number of optical isomers is
1
2
4
8
Which of the following compound is not aromatic?
1, 3-cyclobutadene
Pyridine
Furan
Thiophene
A.
1, 3-cyclobutadene
According to Huckel's rule, the planar cyclically conjugated structures having (4n + 2) T electrons (where, n is 0, 1,2 etc) are considered as aromatic compounds.
However, cyclobutadien have 4n electrons which are involved in cyclic delocalisation are referred to as anti aromatic compounds.
The structure shows
geometrical isomerism
optical isomerism
geometrical and optical isomerism
tautomerism
What is the correct IUPAC name of
4-methoxy-2-nitrobenzaldehyde
4-formyl-3-nitroanisole
4-methoxy-6-nitrobenzaldehyde
2-formyl-5-methoxynitrobenzene