91. Which of the following can be used to distinguish aldehydes and ketones?
A
$${\text{Fehling's solution}}$$
B
$${H_2}S{O_4}\,{\text{solution}}$$
C
$$NaHS{O_3}$$
D
$$N{H_3}$$
Answer :
$${\text{Fehling's solution}}$$
92. In which of the following the number of carbon atoms does not remain same when carboxylic acid is obtained by oxidation?
A
$$C{H_3}COC{H_3}$$
B
$$CC{l_3}C{H_2}CHO$$
C
$$C{H_3}C{H_2}C{H_2}OH$$
D
$$C{H_3}C{H_2}CHO$$
Answer :
$$C{H_3}COC{H_3}$$
93. Pinacolone is
A
2, 3 - dimethyl - 2, 3 - butanediol
B
3, 3 - dimethyl - 2 - butanon
C
1 - phenyl - 2 - propanone
D
1, 1 - diphenyl - 2 - ethanediol
Answer :
3, 3 - dimethyl - 2 - butanon
94.
\[\xrightarrow[\left( 1\,eq. \right)]{PhMgBr}\,\,\xrightarrow[\left( 1\,eq. \right)]{C{{H}_{3}}MgBr}\,\,\xrightarrow[\left( 1\,eq. \right)]{{{H}^{+}}/{{H}_{2}}O}\] Product.
The product formed in the reaction is –
A
B
C
D
Answer :
95.
The increasing order of the rate of $$HCN$$ addition to compound $$A - D$$ is
$$\eqalign{
& \left( {\text{i}} \right)HCHO \cr
& \left( {{\text{ii}}} \right)C{H_3}COC{H_3} \cr
& \left( {{\text{iii}}} \right)PhCOC{H_3} \cr
& \left( {{\text{iv}}} \right)PhCOPh \cr} $$
A
(iv) < (iii) < (ii) < (i)
B
(iii) < (iv) < (ii) < (i)
C
(i) < (ii) < (iii) < (iv)
D
(iv) < (ii) < (iii) < (i)
Answer :
(iv) < (iii) < (ii) < (i)
96. Which of the following statements is not correct?
A
Aldehydes and ketones are functional isomers.
B
Formaldehyde reacts with ammonia to form hexamethylenetetramine.
C
$$LiAl{H_4}$$ converts ketones into $$sec$$ -alcohols.
D
Ethanal and propanal give positive iodoform test.
Answer :
Ethanal and propanal give positive iodoform test.
97. What is the test to differentiate between pentan -2-one and pentan-3-one?
A
Iodoform test
B
Benedict's test
C
Fehling's test
D
Aldol condensation
Answer :
Iodoform test
98. Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of
A
two ethylenic double bonds
B
a vinyl group
C
an isopropyl group
D
an acetylenic triple bond
Answer :
a vinyl group
99.
Match the column I with column II and mark the appropriate choice.
A
A - ii, B - iv, C - iii, D - i
B
A - i, B - iii, C - ii, d - iv
C
A - iii, B - ii, C - i, D - iv
D
A - iv, B - i, C - ii, D - iii
Answer :
A - ii, B - iv, C - iii, D - i
100. A diene, buta-1, 3-diene was subjected to ozonolysis to prepare aldehydes. Which of the following aldehydes will be obtained during the reaction?
A
B
C
D
Answer :