1
WB JEE 2024
MCQ (Single Correct Answer)
+2
-0.5
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WB JEE 2024 Chemistry - Hydrocarbons Question 4 English

$$\mathrm{Q}$$ and $$\mathrm{R}$$ in the above reaction sequences are respectively

A
$$ \mathrm{Hg}(\mathrm{OAc})_2, \mathrm{NaBH}_4 / \overline{\mathrm{O}} \mathrm{H} ; \mathrm{B}_2 \mathrm{H}_6, \mathrm{H}_2 \mathrm{O}_2 / \overline{\mathrm{O}} \mathrm{H} $$
B
$$ \mathrm{B}_2 \mathrm{H}_6, \mathrm{H}_2 \mathrm{O}_2 / \overline{\mathrm{O}} \mathrm{H} ; \mathrm{H}^{+} / \mathrm{H}_2 \mathrm{O} $$
C
$$ \mathrm{Hg}(\mathrm{OAc})_2, \mathrm{NaBH}_4/ \overline{\mathrm{O}} \mathrm{H} ; \mathrm{H}^{+} / \mathrm{H}_2 \mathrm{O} $$
D
$$ \mathrm{B}_2 \mathrm{H}_6, \mathrm{H}_2 \mathrm{O}_2 / \overline{\mathrm{O}}\mathrm{H} ; \mathrm{Hg}(\mathrm{OAc})_2, \mathrm{NaBH}_4 / \overline{\mathrm{O}} \mathrm{H} $$
2
WB JEE 2024
MCQ (Single Correct Answer)
+2
-0.5
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$$\mathrm{pH}$$ of $$10^{-8}(\mathrm{M}) \mathrm{~HCl}$$ solution is

A
8
B
greater than 7, less than 8
C
greater than 8
D
greater than 6, less than 7
3
WB JEE 2024
MCQ (Single Correct Answer)
+2
-0.5
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The specific conductance $$(\mathrm{k})$$ of $$0.02(\mathrm{M})$$ aqueous acetic acid solution at $$298 \mathrm{~K}$$ is $$1.65 \times 10^{-4} \mathrm{~S} \mathrm{~cm}^{-1}$$. The degree of dissociation of acetic acid is

$$[\lambda_{\mathrm{O}^{+}}+=349.1 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1} \text { and } \lambda_{{ }^{\circ} \mathrm{CH}_3 \mathrm{COO}^{-}}=40.9 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}]$$

A
0.021
B
0.21
C
0.012
D
0.12
4
WB JEE 2024
MCQ (Single Correct Answer)
+2
-0.5
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The number(s) of $$-\mathrm{OH}$$ group(s) present in $$\mathrm{H}_3 \mathrm{PO}_3$$ and $$\mathrm{H}_3 \mathrm{PO}_4$$ is/are

A
3 and 3 respectively
B
3 and 4 respectively
C
2 and 3 respectively
D
1 and 3 respectively
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