24. The correct statement regarding electrophile is
[NEET -2017]
(1) Electrophile is a negatively charged species and
can form a bond by accepting a pair of electrons
from a nucleophile.
(2) Electrophile is a negatively charged species and
can from a bond by accepting a pair of electrons
from another electrophile.
(3) Electrophiles are generally neutral species and
can from a bond by accepting a pair of electrons
from a nucleophile.
(4) Electrophile can be either neutral or positively
charged species and can form a bond by accepting a
pair of electrons from a nucleophile.
25. Which of the following molecules represents the
order of hybridisation sp
2
, sp
2
, sp, sp from left to
right atoms ? [ NEET - 2018 ]
(1) CH
2
= CH – CH = CH
2
(2) CH
2
= CH – C
CH
30. Assertion : The pK
a
of acetic acid is lower than
that of phenol. [AIIMS 2004]
Reason : Phenoxide ion is more resonance stabilised.
(1) If both assertion and reason are true and reason
is a correct explanation of assertion.
(2) If both assertion and reason are true but reason
is not a correct explanation of assertion.
(3) If assertion is true but reason is false.
(4) If assertion and reason both are false.
31. Pyridine is less basic than triethylamine because :
[AIIMS 2005]
(1) Pyridine has aromatic character
(2) Nitrogen in pyridine is sp
2
hybridised
(3) Pyridine is a cyclic system
(4) In pyridine, lone pair of nitrogen is delocalised
32. The decreasing order of the stability of the ions :
[AIIMS 2007]
(3) HC
C – C
CH
(4) CH
3
– CH = CH – CH
3
CH
3
—
CH
—CH
3
CH
3
—
CH
—OCH
3
26. The number of sigma () and pi () bonds in pent-2-
en-4-yne is:- [ NEET -2019 ]
(1) 10 bonds and 3 bonds
(2) 8 bonds and 5 bonds
(3) 11 bonds and 2 bonds
(4) 13 bonds and no bond
GOC_AIIMS
27. The most stable ion is : [AIIMS 2002]
(I) (II)
CH
3
—
CH
—COCH
3
(III)
(1) I > II > III (2) III > II > I
(3) II > III > I (4) II > I > III
33. Assertion : Amines are more basic than esters and
ethers. [AIIMS 2007]
Reason : Nitrogen is less electronegative than oxy-
(1) CH
3
CH
2
(2)
(CH
3
)
2
CH
gen. It is in better position to accommodate the posi-
tive charge on the proton.
(3) (CH
3
)
3
(4) C
6
H
5
CH
2
(1) If both assertion and reason are true and reason
is a correct explanation of assertion.
28. Among the following the strongest acid is :
[AIIMS 2003]
(1) CH
3
COOH
(2) C
6
H
5
COOH
(3) m-CH
3
OC
6
H
4
COOH
(4) p-CH
3
OC
6
H
4
COOH
29. Among the following the weakest base is :
[AIIMS 2003]
(1) C
6
H
5
CH
2
NH
2
(2) C
6
H
5
CH
2
NHCH
3
(3) O
2
N.CH
2
NH
2
(4) CH
3
NHCHO
(2) If both assertion and reason are true but reason
is not a correct explanation of assertion.
(3) If assertion is true but reason is false.
(4) If assertion and reason both are false.
34. Maximum enol content is in : [AIIMS 2008]
(1) (2)
(3) (4)