Given that phenylboronic acid upon nitration gives 15% orthosubstitution product and 85% meta product. The meta directing effect of the –B(OH) 2 group is to be explained. Concept introduction: The substituents attached to the ring have a strong influence on the incoming electrophile. Electron releasing substituent groups, except halogens, activate the ring and direct the incoming electrophile to the o- and p- positions. Halogens are o- and p- directors but they deactivate the ring. Electron withdrawing substituent groups deactivate the ring and direct the incoming electrophile to the m- position. Boron compounds are usually electron acceptors as in these compounds boron is electron deficient. To explain: The meta directing effect of the –B(OH) 2 group as upon nitrating phenylboronic acid 15% orthosubstitution product and 85% meta product are obtained.

Question

Gas Law Studies 1. Mass of zinc Determination of 0.899 2) Moles of zinc 0.01361 mol 3.) Moles of hydrogen 00? ← I was told to calculate this number from mole of zinc. 350m So does that mean it will be 0.01361 mol too? 4 Volume of water collected (mL) 5) VL of water collected (Liters) 0.350 L 6) Temp of water collected (°C) 7) Temp of water collected (°K) 8) Atmospheric pressure (mm) 9) Vapor pressure of water (mm) 10) Corrected pressure of hydrogen 20% 29°C 764.0mm Hg (mm) 17.5mm 11) Corrected pressure of hydrogen (atm) 12) Experimentally calculated value of 19 13. Literature value of R 14) % Error 15) Suggest reasons for the % error (#14)

Answer 1

Question

Chapter 16.SE, Problem 66AP

Interpretation Introduction

Interpretation:

Given that phenylboronic acid upon nitration gives 15% orthosubstitution product and 85% meta product. The meta directing effect of the –B(OH)₂ group is to be explained.

Concept introduction:

The substituents attached to the ring have a strong influence on the incoming electrophile. Electron releasing substituent groups, except halogens, activate the ring and direct the incoming electrophile to the o- and p- positions. Halogens are o- and p- directors but they deactivate the ring. Electron withdrawing substituent groups deactivate the ring and direct the incoming electrophile to the m- position. Boron compounds are usually electron acceptors as in these compounds boron is electron deficient.

To explain:

The meta directing effect of the –B(OH)₂ group as upon nitrating phenylboronic acid 15% orthosubstitution product and 85% meta product are obtained.

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