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On March 11, 2024, 11:35 AM

Page No 335: - Chapter 11 Alcohols Phenols & Ethers Intext Solutions class 12 ncert solutions Chemistry - SaraNextGen [2024]


Question 11.6:

Give structures of the products you would expect when each of the following alcohol reacts with (a) HCl-ZnCl2 (b) HBr and (c) SOCl2.

(i) Butan-1-ol

(ii) 2-Methylbutan-2-ol

Answer:

(a)

(i)

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5888/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_6eb4c42a.gif

Primary alcohols do not react appreciably with Lucas’ reagent (HCl-ZnCl2) at room temperature.

(ii)

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5888/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_m4d24dc31.jpg

Tertiary alcohols react immediately with Lucas’ reagent.

(b)

(i)

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5888/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_d85e47a.gif

(ii)

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5888/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_6c1929e4.jpg

(c)

(i)

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5888/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_m1c4aab5b.gif

(ii)

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5888/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_m38e4e1c9.jpg

Question 11.7:

Predict the major product of acid catalysed dehydration of

(i) 1-Methylcyclohexanol and

(ii) Butan-1-ol

Answer:

1.

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5889/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_m489c21ee.jpg

(ii)

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5889/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_m11920ce1.gif

Question 11.8:

Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5890/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_4969df05.jpg

Resonance structure of the phenoxide ion

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5890/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_m238cc3e6.jpg

Resonance structures of p-nitrophenoxide ion

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5890/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_m2b7eb666.jpg

Resonance structures of o-nitrophenoxide ion

It can be observed that the presence of nitro groups increases the stability of phenoxide ion.

Question 11.9:

Write the equations involved in the following reactions:

(i) Reimer-Tiemann reaction

(ii) Kolbe’s reaction

Answer:

1. ReimerTiemann reaction

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5891/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_m7c3f060f.jpg

2. Kolbe’s reaction

https://img-nm.mnimgs.com/img/study_content/curr/1/12/17/270/5891/NS_25-11-08_Utpal_12_Chemistry_11_12_GSX_html_m3db4662d.jpg

Also Read : Page-No-342:-Chapter-11-Alcohols-Phenols-&-Ethers-Intext-Solutions-class-12-ncert-solutions-Chemistry

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