Which of the following is the most stable compound?
Ph3
Ph2H
Ph2H2
PhH2
A.
Ph3
Resonance stabilises the compound. Therefore, Ph3 is most stable due to presence of three benzene rings which are resonance stabilised.
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
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