Carbanion
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Q. Which of the following statements is true for a paramagnetic substance?
- These substances are weakly attracted by an external magnetic field, due to presence of the unpaired electrons.
- These substances are strongly attracted by an applied magnetic field and can be permanently magnetised.
- NaCl, KCl are examples of paramagnetic substances
- (a) and (c) above.
Q. The hybridisation of carbanion is:
- sp
- sp2
- sp3
- sp2d
Q.
Which of the following species is paramagnetic in nature?
Carbanion
Both (a) and (b)
Carbocation
None of the above
Q. Identify a molecule which is paramagnetic in nature.
- N2
- H2
- O2
- He2
Q.
Which of the following is a carbanion?
CH3−⊖CH2
CH3−⊕CH2
C6H5−.CH2
None of these
Q. In which of the following pairs of carbocations, the first carbocation is more stable than the second?
(i) CH2=CH−+CH2 and CH2=CH−CH2−+CH2
(ii) CH3−NH−+CH2 and +CH2−OH
(iii) CH3−O−CH2−+CH2 and CH2−O−+CH2
(iv) CH3−+CH−CH2CH2CH3 and CH3CH2−+CH−CH2CH3
- (i), (ii) and (iii)
- (i), (ii) and (iv)
- (iii) and (iv)
- (ii) and (iii)
Q. Which of the following is correct regarding a carbanion intermediate?
- It is formed due to homolytic cleavage.
- It is an electron deficient species.
- It is sp3 hybridised.
- None of the above
Q. Rank the following intermediates according to the stability (most stable first) :
CH3CH2CH2⊕CH2, CH3⊕CHCH2CH3, (CH3)2⊕CCH2CH3, (CH3)3⊕C
- (CH3)2⊕CCH2CH3>(CH3)3⊕C>CH3⊕CHCH2CH3>CH3CH2CH2⊕CH2
- (CH3)3⊕C>(CH3)2⊕CCH2CH3>CH3⊕CHCH2CH3>CH3CH2CH2⊕CH2
- (CH3)3⊕C>(CH3)2⊕CCH2CH3>CH3CH2CH2⊕CH2>CH3⊕CHCH2CH3
- (CH3)3⊕C>CH3⊕CHCH2CH3>(CH3)2⊕CCH2CH3>CH3CH2CH2⊕CH2
Q. Which of the following is correct regarding a carbanion intermediate?
- It is sp3 hybridised.
- It is formed due to homolytic cleavage.
- It is an electron deficient species.
- None of the above
Q. Which of the following statement is incorrect about nucleophiles?
- Nucleophiles have an unshared electron pair and can make use of this to react with an electron deficient species
- The nucleophilicity of an element (an electron donor) generally increases on going down a group in the periodic table
- A nucleophile is an electron-deficient species
- None of the above
Q.
Consider the following carbocations
(1) CH3−⊕CH2 (2) CH2=⊕CH (3) CH2=CH−⊕CH2 (4) C6H5−⊕CH2 stability of these carbocations in decreasing order is
4>3>1>2
4>3>2>1
3>4>2>1
3>4>1>2
Q.
Which of the following species is paramagnetic in nature?
Carbocation
Carbanion
Both (a) and (b)
None of the above
Q. Which of the following is/are paramagnetic?
NO2, NO, N2O4, N2O2, N2O5
NO2, NO, N2O4, N2O2, N2O5
- Only NO2
- NO, NO2, N2O5
- All are paramagnetic
- NO2, NO
Q. Find out the order of stability between (A) CH3−CH2−C|COOHH−−CH−CH3
(B) CH3−C|COOHH−CH2−−CH−CH3
(C) C|COOHH2−CH2−CH2−−CH−CH3
(B) CH3−C|COOHH−CH2−−CH−CH3
(C) C|COOHH2−CH2−CH2−−CH−CH3
- A>B>C
- B>A>C
- C>A>B
- B>C>A
Q. Which of the following compounds is the most acidic?
Q.
State true or false.
O2, O−2 are paramagnetic while O3, O2−2 are diamagnetic.- True
- False
Q. The carbocation is (CH3)−C+H−(CH3) less stable than:
- (CH3)−CH2−+CH2
- none of these
- (CH3)3+C
- +CH3
Q. For the following compounds, choose the correct option:
- II has the least acidic strength
- IV has the least acidic strength
- I has the highest acidic stength
- IV has the highest acidic stength
Q. The hybridisation of carbanion is:
- sp
- sp2
- sp3
- sp2d
Q. Choose the incorrect statement regarding acidic order:
- Phenol is more acidic than benzoic acid
- 4-Chlorophenol is more acidic than phenol
- 4-methylbenzoic acid is less acidic than benzoic acid
- Phenol is less acidic than benzoic acid
Q. A ferrimagnetic material is one that has populations of atoms with opposing magnetic moments, the opposing moments are unequal and a spontaneous magnetization remains.
If this is true enter 1, if false enter 0.
If this is true enter 1, if false enter 0.
Q.
Which of the following names is/are correct for the given compound?
a) 4-bromo-2-ethyl aniline
b) 4-bromo-2-ethyl benzenamine
c) 4-bromo-2-ethyl aminobenzene
d) 3-bromo-1-ethyl benzenamine
a) 4-bromo-2-ethyl aniline
b) 4-bromo-2-ethyl benzenamine
c) 4-bromo-2-ethyl aminobenzene
d) 3-bromo-1-ethyl benzenamine
- d only
- a and b only
- a, b and c only
- a, b, c and d
Q. Comparing (a) and (b), which of the following statement(s) is/are correct?
- Both (a) and (b) shows ortho effect
- (b) is more acidic than (a)
- Conjugate base of (b) is stabilised by hydrogen bonding
- (a) is more acidic than (b)
Q. Name the functional group present in CH3COCH3
Q. Na2O2 is an oxide of alkali metal which is diamagnetic.
If true enter 1, else enter 0.
If true enter 1, else enter 0.
Q. A certain alkaloid has 70.8% carbon, 6.2% hydrogen, 4.1% nitrogen and the rest oxygen. What is its empirical formula?
- C20H21NO4
- C20H20NO4
- C21H20NO3
- C20H19NO3
Q. Some of the properties of the two species, NO−3 and H3O+ are described below. Which one of them is correct?
- Dissimilar in hybridization for the central atom with different structure
- Isostructural with same hybridization for the central atom
- Isostructural with different hybridization for the central atom
- Similar in hybridization for the central atom with different structures
Q. ClO2 is paramagnetic due to ______ unpaired electron(s).
Q. Paramagnetic behaviour is observed in ________ out of O3, O2, NO and NO2 :
- O2
- O3
- NO
- NO2
Q. Which of the following represent the correct order of stability of the given carbocations?
- III>I>II
- I>III>II
- III>II>I
- II>III>I
