141. The correct nucleophilicity order is
A
$$CH_3^ - < NH_2^ - < H{O^ - } < {F^ - }$$
B
$$CH_3^ - \simeq NH_2^ - > H{O^ - } \simeq {F^ - }$$
C
$$CH_3^ - > NH_2^ - > H{O^ - } > {F^ - }$$
D
$$NH_2^ - > {F^ - } > H{O^ - } > CH_3^ - $$
Answer :
$$CH_3^ - > NH_2^ - > H{O^ - } > {F^ - }$$
142.
The correct number of chiral centres in
A
1
B
3
C
4
D
2
Answer :
2
143.
The IUPAC name of the compound having the formula
A
3, 3, 3 - Trimethyl - 1 - propene
B
1, 1, 1 - Trimethyl - 2 - propene
C
3, 3 - Dimethyl - 1 - butene
D
2, 2 - Dimethyl - 3 - butene
Answer :
3, 3 - Dimethyl - 1 - butene
144.
The molecular formula of diphenyl methane
is $${C_{13}}{H_{12}}$$
How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom?
A
6
B
4
C
8
D
7
Answer :
4
( diphenyl methane ) $${C_{13}}{H_{12}}$$
145.
Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds
A
1 > 2 > 3 > 4
B
4 > 3 > 2 > 1
C
2 > 1 > 3 > 4
D
2 > 3 > 1 > 4
Answer :
2 > 1 > 3 > 4
146.
Few mixtures and their methods of separation are given in the columns I and II respectively. Match the columns and mark the appropriate choice.
| Column I | Column II | ||
|---|---|---|---|
| a. | Ether + Toluene | 1. | Steam distillation |
| b. | $$o$$ - Nitrophenol + $$p$$ - Nitrophenol | 2. | Distillation |
| c. | Benzoic acid + Benzaldehyde | 3. | Fractional distillation |
| d. | Fractions of crude oil | 4. | Sublimation |
A
a - 3, b - 2, c - 1, d - 4
B
a - 2, b - 3, c - 1, d - 4
C
a - 2, b - 1, c - 4, d - 3
D
a - 1, b - 3, c - 2, d - 4
Answer :
a - 2, b - 1, c - 4, d - 3
147. The carbocation $$C{H_3}\mathop C\limits^ + HC{H_3}$$ is less stable than
A
$$C{H_3}C{H_2}\mathop C\limits^ + {H_2}$$
B
$$\mathop C\limits^ + {H_3}$$
C
$${\left( {C{H_3}} \right)_3}\mathop C\limits^ + $$
D
$$C{H_3}\mathop C\limits^ + {H_2}$$
Answer :
$${\left( {C{H_3}} \right)_3}\mathop C\limits^ + $$
148. Which of the following sets of groups contain only electrophiles?
A
$$NH_2^ - ,NO_2^ + ,{H_2}O,N{H_3}$$
B
$${F^ - },O{H^ - },N{H_3},S{O_3}$$
C
$$NO_2^ + ,AlC{l_3},S{O_3},C{H_3}\mathop C\limits^ + = O$$
D
$$N{H_3},B{F_3},AlC{l_3},{H_2}O$$
Answer :
$$NO_2^ + ,AlC{l_3},S{O_3},C{H_3}\mathop C\limits^ + = O$$
149.
Which of the following names is correct for
?
A
3-Formylpentane-1, 3-dial
B
1, 2, 3-Triformylpropane
C
2-Formylmethylbutane-1, 4-dial
D
Propane-1, 2, 3-tricarbaldehyde
Answer :
Propane-1, 2, 3-tricarbaldehyde
150.
IUPAC name of the compound
A
2, 3-dimethylheptane
B
3-methyl-4-ethyloctane
C
5-ethyl-6-methyloctane
D
4-ethyl-3-methyloctane
Answer :
4-ethyl-3-methyloctane