B) Proceeds through a carbocation intermediate in two steps, with rate dependent only on substrate concentration. SN1: two-step, unimolecular. Step 1: leaving group departs (carbocation). Step 2: nucleophile attacks. Racemization.

An SN1 reaction:

A Is bimolecular

B Proceeds through a carbocation intermediate in two steps, with rate dependent only on substrate concentration

C Requires a strong nucleophile

D Gives inversion only

✓ Correct Answer: Option B

SN1: two-step, unimolecular. Step 1: leaving group departs (carbocation). Step 2: nucleophile attacks. Racemization.

💡 Why is B) the correct answer?

The correct answer to the question "An SN1 reaction:" is Option B: Proceeds through a carbocation intermediate in two steps, with rate dependent only on substrate concentration.

The other options — A) Is bimolecular, C) Requires a strong nucleophile, D) Gives inversion only — are incorrect for this PCAT Exam Prep question. As explained above: SN1: two-step, unimolecular. Step 1: leaving group departs (carbocation). Step 2: nucleophile attacks. Racemization.

📚 About This PCAT Exam Prep Practice Question

This 2-level PCAT Exam Prep question from the Chemical Processes topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free PCAT Exam Prep practice test or use flashcards for spaced repetition review.

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An SN1 reaction:

✓ Correct Answer: Option B

📚 About This PCAT Exam Prep Practice Question

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