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51.

Indicate the type of hybridization of each carbon atom in the following molecules: (i) `CH_(3)-C-=CH-CH_(3)` (ii) `H_(2)C=C=CH_(2)` (iii) `CH_(3)-CH=CH-CH_(3)` (iv) `CH_(3)-CH_(2)-CH_(3)`

Answer» (i) `overset(1)(C)H_(3)-overset(2)(C)-=overset(3)(C)-overset(4)(C)H_(3)`
Carbon -1 is linked with four atoms `= sp^(3)`-hybridization
Carbon-2 is linked with two atoms =sp-hybridization
Carbon-3 is linked with two atoms = sp-hybridization
Carbon-4 is linked with four atoms = `sp^(3)`-hybridization.
(i) `H_(2)overset(1)(C)=overset(2)(C)=overset(3)(C)H_(2) C_(1)=sp^(2), C_(2)=sp` and `C_(3)=sp^(2)`
(ii) `overset(1)(C)H_(3)-overset(2)(CH)=overset(3)(C)H-overset(4)(C)H_(3) C_(1)=sp^(3), C_(2)=sp^(2), C_(3)=sp^(2)` and `C_(4) = sp^(3)`
(iv) `overset(1)(C)H_(3) -overset(2)(C)H_(2)-overset(3)(C)H_(3)C_(1)=sp^(3),C_(2)=sp^(3), C_(3)=sp^(3)`
Discussion
52.

Hybridization of `C_(2)` and `C_(3)` of `H_(3)C-CH=C=CH-CH_(3)` are:A. `sp,sp`B. `sp,sp^(3)`C. `sp^(2),sp^(2)`D. `sp^(2),sp`

Answer» Correct Answer - D
Discussion
53.

Arrange the following molecules in the correct order of decreasing C-C bond length:A. `C_(2)H_(4) gt C_(2)H_(2) gt C_(2)H_(6) gt C_(6)H_(6)`B. `C_(2)H_(6) gt C_(6)H_(6)gt C_(2)H_(4) gt C_(2)H_(2)`C. `C_(2)H_(6) gt C_(2)H_(4) gt C_(6)H_(6)gt C_(2)H_(2)`D. `C_(2)H_(2) gt C_(6)H_(6) gt C_(2)H_(4) gt C_(2)H_(6)`

Answer» Correct Answer - B
Discussion
54.

The decreasing order of blood dissociation energies of C-C, C-H and H-H bonds is:A. `H-H gt -C-H gt -C-C-`B. `-C-C-gt -C-H gt H-H`C. `-C-H gt -C-C-gt H-H`D. `-C-C-gt H-Hgt -C-H`

Answer» Correct Answer - A
Discussion
55.

Arrange the following bonds in decreasing order of bond length: `{:(Cl-overset(Cl)overset(|)underset(Cl)underset(|)(C)underset(1)(-)Cl,H-underset(Cl)underset(|)overset(Cl)overset(|)(C)-underset(2)(Cl),Cl-overset(H)overset(|)underset(H)underset(|)(C)underset(3)(-)Cl,H-overset(H)overset(|)underset(H)underset(|)(C)underset(4)(-)Cl):}`A. `1 gt 2 gt 3gt 4`B. `4 gt 3 gt 2gt 1`C. `2 gt 3gt 1 gt 4`D. `4 gt 1 gt 2 gt 3`

Answer» Correct Answer - B
Discussion
56.

The compound shown is planar and all the C-C bond lengths are the same. What is the bonding of `sp^(2)`-hybridized boron? A. The p-orbital contains an unshared pair of electronsB. A hybrid orbital contains an unshared pair of electronsC. The p-orbital is vacantD. A hybrid orbital is vacant

Answer» Correct Answer - C
Discussion
57.

(A) Pyrrole is more basic than pyridine. (R) In pyrrole, nitrogen is `sp^(2)`-hybridized.A. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is the correct explanation for statement-1 (A).B. Statement-1 (A) and statement-2 (R) are true and statement-2 (R) is not the correct explanation for statement-1 (A)C. Statement-1 (A) is true, statement-2 (R) is falseD. Statement-1 (A) is false, statement-2 (R) is true

Answer» Correct Answer - D
Discussion
58.

In which of the compounds below is there more than one kind of hybridization `(sp,sp^(2),sp^(3))` for carbon? (i) `CH_(3)CH_(2)CH_(2)CH_(3)` (ii) `CH_(3)-CH=CH-CH_(3)` (iii) `H_(2)C-CH-CH-CH_(2)` (iv) `H-C-=C-H`A. (i) and (iv)B. (ii) and (iii)C. (ii)D. (iii) and (iv)

Answer» Correct Answer - C
Discussion
59.

Arrange the following C-H bonds `(alpha, beta, gamma)` in decreasing order of bond energy: A. `alpha gt beta gt gamma`B. `gamma gt beta gt alpha`C. `beta gt alpha gt gamma`D. `gamma gt alpha gt beta`

Answer» Correct Answer - B
Discussion
60.

Which of the following is unacceptable resonating structure of buta-12,3-triene?A. `overset(-)overset(•)(C)H_(2)-C-=C-overset(o+)(C)H_(2)`B. `CH_(2)=C=C=CH_(2)`C. `overset(o+)(C)H_(2)-C-=C-overset(-)overset(••)(C)H_(2)`D. `overset(-)overset(•)(C)H_(2)-C-=C-overset(•)(C)H_(2)`

Answer» Correct Answer - D
Discussion
61.

Which of the following compounds has (have) sp-hybridized carbon atom?A. `CH_(2)=C=O`B. `CH_(2)=CH-CN`C. `CH_(3)-CH=CH_(2)`D. `H_(2)C=O`

Answer» Correct Answer - A::B
Discussion
62.

Among the following four structures, one is not a permissible resonance form. Identify the wrong structure.A. `overset(+)(C)H_(2)-overset(..)underset(" "CH_(3))underset(|)(N)-overset(-)overset(..)underset(..)O:`B. `CH_(2)-overset(+)underset(" "CH_(3))underset(|)(N)-overset(-)ddotunderset(..)O:`C. `CH_(2)-underset(CH_(3))underset(|)(N)=underset(..)O:`D. `:overset(-)(C)H_(2)-overset(+)underset(CH_(3))underset(|)(N)=underset(..)O:`

Answer» Correct Answer - C
Discussion
63.

Resonating structures of a molecule have:A. identical bondingB. different bondingC. identical arrangement of atoms and nearly same energiesD. tha same number of paired and unpaired electrons

Answer» Correct Answer - B::C::D
Discussion
64.

The resonating structures of cyanate ion are `O=C=overset(1-)(N)harroverset(1-)(O)-C-=Nharroverset(1+)-=C-overset(2-)(N)` . The correct set of oxidation states of O, C and N respectively with the most stable structure out of the above is :A. (i) `-3,+4,-2`B. (ii)`-2,+4,-3`C. (iii)`-1,+4,-3`D. (i)`0,+4,-5`

Answer» Correct Answer - B
Discussion
65.

Arrange the following resonating structures in the order of decreasing stability : (a) `underset(("Vinyl chloride"))underset((I))(CH_(2)=CH-ddotunderset(..)Cl: )harrunderset((II))( :overset(Theta)(CH_(2))-CH=overset(o+)underset(..)Cl: )harrunderset((III))(overset(o+)CH_(2))-CH=underset(..)ddotCl^(Theta)` b. `underset(("Formic acid"))underset((IV))(H-overset(ddotO: )overset(||)C)-underset(..)ddotOH harrunderset((V))(H-overset( :ddotO:^(Theta))overset(|)(C)=underset(o+)ddotO)-H harrunderset((VI))(H-overset( :ddotO:^(Theta))overset(|)underset(o+)(C)-underset(..)ddotO-Hharr) underset((VII))(H-underset(ddotTheta)overset( overset(o+):O: )overset(|)C-underset(..)ddotO-H)` ( c) Write the resonating structure of phenol in order of decreasing stability.A. `I gt II gt III`B. `III gt II gt I`C. `II gt I gt III`D. `I gt I -= III`

Answer» Correct Answer - A
Discussion
66.

Arrange the following resonating structures of formic acid in order of decreasing stability: `underset((I))(H-overset(O)overset(||)(C)-OH)harrunderset((II))(H-overset(O^(-))overset(||)(C)-overset(+)(O)H)harr underset((III))(Hoverset(O^(-))overset(|)underset(+)(C)-OH)harrunderset((IV))(H-overset(O^(-))overset(|)underset(-)(C)-O)`A. `II gt I gt III gt IV`B. `I gt III gt II gt IV`C. `III gt II gt IV gt I`D. `IV gt III gt I gt II`

Answer» Correct Answer - B
Discussion
67.

Carbonyl group has following resonating structures (I) The correct order of stablity of these structures isA. `(i) gt (ii) gt (iii)`B. `(iii) gt (i) gt (ii)`C. `(i) gt (iii) gt (ii)`D. `(iii) gt (ii) gt (i)`

Answer» Correct Answer - C
The resonating structure with minimum or no charge is more stable. Thus, the stability of structure (i) is maximum. As the negative charge is present on more electronegative oxygen atom {as in structure (iii)}. (iii) is more stable than structure (ii).
Discussion