The correct order of ease of cleavage of ether linkage by hydrogen halide follows
HI > HBr > HCl
HBr > HI > HCl
HCl > HBr > HI
HCl > HI > HBr
What are the starting materials to get 2-methylpropene as the major product?
Sodium methoxide and sec-butyl bromide
Sodium ethoxide and sec-butyl bromide
Sodium tert-butoxide and ethyl bromide
Sodium methoxide and tert-butyl bromide
Which one of the following is the correct order of increasing basic strength of nitrogen compounds in aqueous solution?
NH3 < C2H5NH2 < C6H5NH2 < (C2H5)2NH < C6H5CH2NH2
C6H5NH2 < NH3 < C6H5CH2NH2 < C2H5NH2 < (C2H5)2NH
(C2H5)2NH < C6H5CH2NH2 < NH3 < C2H5NH2 < C6H5NH2
C6H5CH2NH2 < C2H5NH2 < NH3 < C6H5NH2 < (C2H5)2NH
Hyperconjugation is most useful for stabilising which of the following carbocations?
Neo-pentyl
Tert-butyl
Iso-propyl
Ethyl
The isomerism that arises due to restricted bond rotation is
metamerism
optical isomerism
position isomerism
geometrical isomerism
The IUPAC name of the following compound,[(CH3)2CH—CH2—CH=CH—CH=CH(C2H5)—CH3] is
2, 8-dimethyl-4, 6-decadiene
1, 1, 7, 7-tetramethyl-2, 5-octadiene
1, 5-diisopropyl-1, 4-hexadiene
3, 9-dimethyl-4, 6-decadiene
Aryl halides doesn't undergo nucleophilic substitution reactions under ordinary conditions because of
1. approach of nucleophile is retarded
2. carbon carrying halogen atoms is sp3-hybridised
3. the substrate molecule is destabilised due to resonance
4. partial double bond character between carbon and halogen
2 and 4 only
1 and 4 only
2 and 3 only
2, 3 and 4 only
B.
1 and 4 only
Because of the + R effect of halogen atom, C-X bond of aryl halide has some double bond character, hence it is inert towards nucleophile and approach of nucleophile is retarded.
A solution containing 1.8 g of a compound (empirical formula CH2O) in 40 g of water is observed to freeze at -0.465°C. The molecular formula of the compound is (kf of water = 1.86 kg K mol-1)
C2H4O2
C3H6O
C6H12O6
C5H10O5
The IUPAC name of the compound CH3-CH(CH3) CO- CH3 is
3-methyl 2-butanone
2-methyl 3-butanone
isopropyl methyl ketone
methyl isopropyl ketone
In Lassaigne's test for the detection of halogens, the sodium fusion extract is first boiled with concentrated nitric acid. This is
to remove silver halides
to decompose Na2S and NaCN, if present
to dissolve Ag2S
to dissolve AgCN, if formed