41.
Complete the following reactions by filling most stable intermediate and the product.
\[\left( \text{i} \right)\overset{\begin{smallmatrix}
\,\,\,C{{H}_{3}} \\
|\,\,
\end{smallmatrix}}{\mathop{C{{H}_{3}}-CH-CH}}\,=C{{H}_{2}}+HCl\] \[\to \underset{\text{Intermediate}}{\mathop{\left( A \right)}}\,\xrightarrow{C{{l}^{-}}}\left( B \right)\]
\[\left( \text{ii} \right)\] 
\[+HBr\to \underset{\text{Intermediate}}{\mathop{\left( C \right)}}\,\xrightarrow{B{{r}^{-}}}\left( D \right)\]
A
(a)
B
(b)
C
(c)
D
(d)
Answer :
(b)
42. Tautomerism will be exhibited by
A
$${\left( {C{H_3}} \right)_3}CNO$$
B
$${\left( {C{H_3}} \right)_2}NH$$
C
$${R_3}CN{O_2}$$
D
$$RC{H_2}N{O_2}$$
Answer :
$$RC{H_2}N{O_2}$$
43. A solution of (+) - 2 - chloro - 2 - phenylethane in toluene racemises slowly in the presence of small amounts of $$SbC{l_5}$$ due to the formation of
A
Carbanion
B
Carbene
C
Free radical
D
Carbocation
Answer :
Carbocation
44. Lassaigne's test for the detection of nitrogen fails in
A
$$N{H_2}CONHN{H_2} \cdot HCl$$
B
$$N{H_2}N{H_2} \cdot HCl$$
C
$$N{H_2}CON{H_2}$$
D
$${C_6}{H_5}NHN{H_2} \cdot HCl$$
Answer :
$$N{H_2}N{H_2} \cdot HCl$$
45. Hyperconjugation involves overlap of the following orbitals
A
$$\sigma - \sigma $$
B
$$\sigma - \pi $$
C
$$p - p$$
D
$$\pi - \pi $$
Answer :
$$\sigma - \pi $$
46. Allyl isocyanide has
A
$$9\,\sigma \,\,{\text{and}}\,\,4\,\pi {\text{ - }}\,{\text{bonds}}$$
B
$$8\,\sigma \,\,{\text{and}}\,\,5\,\pi {\text{ - }}\,{\text{bonds}}$$
C
$$9\,\sigma ,3\,\pi \,\,{\text{and}}\,\,2\,{\text{non}}\,{\text{ - bonded electrons}}$$
D
$$8\,\sigma ,3\,\pi \,\,{\text{and}}\,\,4\,{\text{non}}\,{\text{ - bonded electrons}}$$
Answer :
$$9\,\sigma ,3\,\pi \,\,{\text{and}}\,\,2\,{\text{non}}\,{\text{ - bonded electrons}}$$
47. Which of the following is not chiral?
A
2-butanol
B
2, 3-dibromo pentane
C
3-bromo pentane
D
2-hydroxy propanoic acid
Answer :
3-bromo pentane
48. $$1.4\,kg$$ of an organic compound was digested according to Kjeldahl’s method and the ammonia evolved was absorbed in $$60\,mL$$ of $$\frac{M}{{10}}\,{H_2}S{O_4}$$ solution. The excess sulphuric acid required $$20\,mL$$ of $$\frac{M}{{10}}\,NaOH$$ solution for neutralization. The percentage of nitrogen in the compound is :
A
10
B
3
C
24
D
5
Answer :
10
49. Among the following compounds, the most acidic is
A
$$p$$ - nitrophenol
B
$$p$$ - hydroxybenzoic acid
C
$$o$$ - hydroxybenzoic acid
D
$$p$$ - toluic acid
Answer :
$$o$$ - hydroxybenzoic acid
50. Which of the following is not a structure of nitromethane molecule?
A
B
C
D
Answer :