NEET

Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is:

CH₃COOCH₃
CH₃CONH₂
CH₃COOCOCH₃
CH₃COCl

Solution

Cl–is the weakest base and hence better leaving group.

a
b
c
d

Solution

Cyclohexanol (I), acetic acid(II), 2, 4, 6-trinitrophenol (III)and phenol(IV) are given. In these the order of decreasing acidic character will be :

III > II > IV > I
II > III > I > IV
II > III > IV > I
III > IV > II > I

Solution

Which of the following compounds will exhibit cis-trans(geometrical) isomerism?

Butanol
2-Butyne
2-Butenol
2-Butene

Solution

sp³, sp², sp² and sp
sp, sp², sp² and sp³
sp, sp², sp³ and sp²
sp, sp³, sp² and sp³

Solution

sp², sp, sp³
sp, sp³, sp²
sp, sp², sp³
sp³, sp², sp

Solution

C – 1 is sp hybridized (C ≡ C)
C– 3 is sp³ hybridized(C– C)
C – 5 is sp² hybridized (C = C)
Thus the correct sequence is sp, sp³, sp².

a
b
c
d

Solution

How many stereoisomers does this molecule have?
CH₃CH = CHCH₂CHBrCH₃

4
6
8
2

Solution

a
b
c
d

Solution

The order of decreasing reactivity towards an electrophilic reagent, for the following would be
(i)benzene
(ii)toluene
(iii)chlorobenzene
(iv)phenol

(ii)> (iv) > (i) >(iii)
(iv) > (iii) >(ii) > (i)
(iv) > (ii) >(i) > (iii)
(i) > (ii) > (iii)> (iv)

Solution

Electrophiles have high affinity for electrons. They attack at the site where electron-density is highest.Electron donating groups increases the electron density.The electron donating tendency decreases in the order :
–OH > – CH₃ > –H >–Cl
Therefore,the correct order of reactivity towards electrophile is
C₆H₅OH > C₆H₅CH₃> C₆H₆ > C₆H₅Cl

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