121.
Ketones 
where $$R = {R_1} = {\text{alkyl}}$$ group, can be obtained in one step by
A
hydrolysis of esters
B
oxidation of primary alcohol
C
oxidation of tertiary alcohol
D
reaction of acid halide with alcohols
Answer :
oxidation of tertiary alcohol
122.
Identify $$(X), (Y)$$ and $$(Z)$$ in the given reaction sequence.
\[C{{H}_{3}}COC{{H}_{3}}\xrightarrow[\text{heat}]{{{I}_{2}}+NaOH}X\] \[\xrightarrow[\text{heat}]{Ag}Y\xrightarrow[\text{heat}]{\frac{{{H}_{2}}S{{O}_{4}}}{HgS{{O}_{4}}}}Z\]
A
$$X = CH{I_3},Y = C{H_3}CHO,$$ $$Z = HCHO$$
B
$$X = CH{I_3},Y = C{H_3}OH,$$ $$Z = C{H_3}CHO$$
C
$$X = CH{I_3},Y = CH \equiv CH,$$ $$Z = C{H_3}CHO$$
D
$$X = C{H_3}COC{I_3},Y = C{H_2} = C{H_2},$$ $$Z = C{H_3}CHO$$
Answer :
$$X = CH{I_3},Y = CH \equiv CH,$$ $$Z = C{H_3}CHO$$
123.
A single compound of the structure is
obtainable from ozonolysis of which of the following cyclic compounds?
A
B
C
D
Answer :
124.
Identify $$Z$$ in the following reaction sequence.
\[C{{H}_{3}}CHO\xrightarrow[Dil.\,{{H}_{2}}S{{O}_{4}}]{MnO_{4}^{-}}X\xrightarrow{SOC{{l}_{2}}}\] \[Y\xrightarrow[\Delta ]{C{{H}_{3}}COONa}Z\]
A
$$C{H_3}COC{H_2}COONa$$
B
$${\left( {C{H_3}CO} \right)_2}O$$
C
$$C{H_3}CO - O - COC{H_2}Cl$$
D
$$C{H_3}CO - OCOCHC{l_2}$$
Answer :
$${\left( {C{H_3}CO} \right)_2}O$$
125.
A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on
hydrolysis forms a racemic mixture of $$\alpha $$ - hydroxy acid. The carbonyl compound is
A
acetaldehyde
B
acetone
C
diethyl ketone
D
formaldehyde
Answer :
acetaldehyde
126. Reaction by which benzaldehyde cannot be prepared ?
A
$$ + Cr{O_2}C{l_2}$$ and $$C{S_2}$$ followed by $${H_3}{O^ + }$$
$$ + Cr{O_2}C{l_2}$$ and $$C{S_2}$$ followed by $${H_3}{O^ + }$$ B
$$ + {H_2}$$ in presence of $$Pd{\text{ - }}BaS{O_4}$$
$$ + {H_2}$$ in presence of $$Pd{\text{ - }}BaS{O_4}$$ C
$$ + CO + HCl$$ in presence of $$anhy.$$ $$AlC{l_3}$$
$$ + CO + HCl$$ in presence of $$anhy.$$ $$AlC{l_3}$$ D
$$ + Zn/Hg$$ and $$conc.\,HCl$$
$$ + Zn/Hg$$ and $$conc.\,HCl$$
Answer :
$$ + Zn/Hg$$ and $$conc.\,HCl$$
$$ + Zn/Hg$$ and $$conc.\,HCl$$ 
127. The product formed in aldol condensation is
A
a beta-hydroxy acid
B
a beta-hydroxy aldehyde or a beta-hydroxy ketone
C
an alpha-hydroxy aldehyde or ketone
D
an alpha, beta unsaturated ester
Answer :
a beta-hydroxy aldehyde or a beta-hydroxy ketone
128.
Match the reagents in column I with products formed by reactions with acetone in column II and mark the appropriate choice.
A
A - i, B - ii, C - iii, D - iv
B
A - iv, B - iii, C - ii, D - i
C
A - iii, B - i, C - iv, D - ii
D
A - ii, B - iv, C - i, D - iii
Answer :
A - iii, B - i, C - iv, D - ii
129. Polarisation of electrons in acrolein may be written as
A
$$\mathop C\limits^{\delta + } {H_2} = CH - CH = \mathop O\limits^{\delta - } $$
B
$$\mathop C\limits^{\delta + } {H_2} = \mathop C\limits^{\delta + } H - CH = O$$
C
$$\mathop C\limits^{\delta + } {H_2} = CH - CH = \mathop O\limits^{\delta + } $$
D
$$\mathop C\limits^{\delta - } {H_2} = CH - \mathop C\limits^{\delta + } H = O$$
Answer :
$$\mathop C\limits^{\delta + } {H_2} = CH - CH = \mathop O\limits^{\delta - } $$
130.
The correct set of reagents to carry out the following conversion
A
$${B_2}{H_6}/{\text{diglyme}},{H_2}{O_2}/NaOH,PCC/C{H_2}C{l_2}$$
B
$$B{r_2},NaN{H_2},HgS{O_4}/{H_2}S{O_4}$$
C
$${H_2}O/{H_2}S{O_4},Cr{O_3}/{H_2}S{O_4}$$
D
$${\text{None of the above}}$$
Answer :
$${B_2}{H_6}/{\text{diglyme}},{H_2}{O_2}/NaOH,PCC/C{H_2}C{l_2}$$
