1
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following compound cannot be prepared by Williamson's synthesis?

A
$$\mathrm{C}_6 \mathrm{H}_5 \mathrm{OCH}_2 \mathrm{CH}_3$$
B
$$\left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{O}$$
C
$$\left(\mathrm{CH}_3\right)_3 \mathrm{COC}\left(\mathrm{CH}_3\right)_3$$
D
$$\left(\mathrm{CH}_3\right)_3 \mathrm{COCH}_2 \mathrm{CH}_3$$
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

P and Q are considering to apply for a job. The probability that P applies for the job is $$\frac{1}{4}$$. The probability that $$\mathrm{P}$$ applies for the job given that $$\mathrm{Q}$$ applies for the job is $$\frac{1}{2}$$, and the probability that Q applies for the job given that P applies for the job is $$\frac{1}{3}$$. Then the probability that $$\mathrm{P}$$ does not apply for the job given that $$\mathrm{Q}$$ does not apply for the job is

A
$$\frac{4}{5}$$
B
$$\frac{7}{8}$$
C
$$\frac{5}{6}$$
D
$$\frac{11}{12}$$
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { The value of } \frac{i^{1004}+i^{1006}+i^{1008}+i^{1010}+i^{1012}}{i^{510}+i^{508}+i^{506}+i^{504}+i^{502}} \text { is } $$

A
1
B
i
C
$$-1$$
D
$$-$$i
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

There are some baskets. The chances of picking a loaded basket and choosing a red coloured one is 0.2 . For every 100 tries to pick one basket, 60 times a basket is either loaded or red in colour. What is the probability of choosing an empty basket plus choosing not a red coloured one.

A
1.2
B
0.4
C
1.3
D
0.8
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