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KI in acetone, undergoes SN2 reaction with each of P, Q, R and S. The rates of reaction vary as :-

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Options:

1. P > Q > R > S

2. S > P > R > Q

3. P > R > Q > S

4. R > P > S > Q

Figure shows a solenoid connected with a resistance R, a bulb B and a source of emf. The resistance R is adjusted so that when the key K is closed, the bulb just glows. Then, the switch K is suddenly opened. The bulb B will :-

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Options:

1. remain as before

2. go out

3. glow very brightly

4. none of these

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