11. ALCOHOLS, PHENOLS AND ETHERS[KARNATAKA CET EXCLUSIVE]
CHEMISTRY(KCET)

285560 Which of the following orders is true regarding the acidic nature of phenol?

1 Phenol\(>\) o-cresol \(>0\)-nitrophenol
2 \(o\)-Cresol \(<\) phenol \(<\mathrm{O}\)-nitrophenol
3 Phenol\(<\) o-cresol \(>0\)-nitrophenol
4 Phenol\(
CHEMISTRY(KCET)

285561 Which of the followingcannot be used to oxidize primary alcohols to aldehydes?

1 \(\mathrm{CrO}_3\) in anhydrous medium
2 Pyridinium chlorochromate
3 \(\mathrm{KMnO}_4\) in acidic medium
4 Heating in presence of Cu at 573 K
CHEMISTRY(KCET)

285562 The products formed during the following reaction are

Ans:a
Exp:(a) When one of the alkyl groups is tertiary, the alkyl halide is formed from the tertiary alkyl group.
This is due to the reason that the reaction occurs by \(\mathrm{S}_{\mathrm{N}} 1\) mechanism and the formation of products is controlled by the stability of the carbocation resulting from the cleavage of \(\mathrm{C}-\mathrm{O}\) bond in protonated ether (oxonium ion). Since a tert-butyl carbocation is more stable than methyl carbocation, therefore, cleavage of \(\mathrm{C}-\mathrm{O}\) bond gives methyl alcohol and the more stable tert-butyl carbocation. This carbocation then reacts with \(\mathrm{I}^{-}\)ion to form tert-butyl iodide.

CHEMISTRY(KCET)

285563 In the reaction:

\(\begin{aligned}
\text { Ethanol } \xrightarrow{\mathrm{PCl}_5} X \xrightarrow{\text { alc. } \mathrm{KOH}} Y \\
\qquad \xrightarrow[\mathrm{H}_2 \mathrm{O}, \Delta]{\mathrm{H}_2 \mathrm{SO}_4 \text {, Room temp. }} Z
\end{aligned}\)
the product \(Z\) is

1 \(\mathrm{C}_2 \mathrm{H}_4\)
2 \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OCH}_2 \mathrm{CH}_3\)
3 \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OSO}_3 \mathrm{H}\)
CHEMISTRY(KCET)

285560 Which of the following orders is true regarding the acidic nature of phenol?

1 Phenol\(>\) o-cresol \(>0\)-nitrophenol
2 \(o\)-Cresol \(<\) phenol \(<\mathrm{O}\)-nitrophenol
3 Phenol\(<\) o-cresol \(>0\)-nitrophenol
4 Phenol\(
CHEMISTRY(KCET)

285561 Which of the followingcannot be used to oxidize primary alcohols to aldehydes?

1 \(\mathrm{CrO}_3\) in anhydrous medium
2 Pyridinium chlorochromate
3 \(\mathrm{KMnO}_4\) in acidic medium
4 Heating in presence of Cu at 573 K
CHEMISTRY(KCET)

285562 The products formed during the following reaction are

Ans:a
Exp:(a) When one of the alkyl groups is tertiary, the alkyl halide is formed from the tertiary alkyl group.
This is due to the reason that the reaction occurs by \(\mathrm{S}_{\mathrm{N}} 1\) mechanism and the formation of products is controlled by the stability of the carbocation resulting from the cleavage of \(\mathrm{C}-\mathrm{O}\) bond in protonated ether (oxonium ion). Since a tert-butyl carbocation is more stable than methyl carbocation, therefore, cleavage of \(\mathrm{C}-\mathrm{O}\) bond gives methyl alcohol and the more stable tert-butyl carbocation. This carbocation then reacts with \(\mathrm{I}^{-}\)ion to form tert-butyl iodide.

CHEMISTRY(KCET)

285563 In the reaction:

\(\begin{aligned}
\text { Ethanol } \xrightarrow{\mathrm{PCl}_5} X \xrightarrow{\text { alc. } \mathrm{KOH}} Y \\
\qquad \xrightarrow[\mathrm{H}_2 \mathrm{O}, \Delta]{\mathrm{H}_2 \mathrm{SO}_4 \text {, Room temp. }} Z
\end{aligned}\)
the product \(Z\) is

1 \(\mathrm{C}_2 \mathrm{H}_4\)
2 \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OCH}_2 \mathrm{CH}_3\)
3 \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OSO}_3 \mathrm{H}\)
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
CHEMISTRY(KCET)

285560 Which of the following orders is true regarding the acidic nature of phenol?

1 Phenol\(>\) o-cresol \(>0\)-nitrophenol
2 \(o\)-Cresol \(<\) phenol \(<\mathrm{O}\)-nitrophenol
3 Phenol\(<\) o-cresol \(>0\)-nitrophenol
4 Phenol\(
CHEMISTRY(KCET)

285561 Which of the followingcannot be used to oxidize primary alcohols to aldehydes?

1 \(\mathrm{CrO}_3\) in anhydrous medium
2 Pyridinium chlorochromate
3 \(\mathrm{KMnO}_4\) in acidic medium
4 Heating in presence of Cu at 573 K
CHEMISTRY(KCET)

285562 The products formed during the following reaction are

Ans:a
Exp:(a) When one of the alkyl groups is tertiary, the alkyl halide is formed from the tertiary alkyl group.
This is due to the reason that the reaction occurs by \(\mathrm{S}_{\mathrm{N}} 1\) mechanism and the formation of products is controlled by the stability of the carbocation resulting from the cleavage of \(\mathrm{C}-\mathrm{O}\) bond in protonated ether (oxonium ion). Since a tert-butyl carbocation is more stable than methyl carbocation, therefore, cleavage of \(\mathrm{C}-\mathrm{O}\) bond gives methyl alcohol and the more stable tert-butyl carbocation. This carbocation then reacts with \(\mathrm{I}^{-}\)ion to form tert-butyl iodide.

CHEMISTRY(KCET)

285563 In the reaction:

\(\begin{aligned}
\text { Ethanol } \xrightarrow{\mathrm{PCl}_5} X \xrightarrow{\text { alc. } \mathrm{KOH}} Y \\
\qquad \xrightarrow[\mathrm{H}_2 \mathrm{O}, \Delta]{\mathrm{H}_2 \mathrm{SO}_4 \text {, Room temp. }} Z
\end{aligned}\)
the product \(Z\) is

1 \(\mathrm{C}_2 \mathrm{H}_4\)
2 \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OCH}_2 \mathrm{CH}_3\)
3 \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OSO}_3 \mathrm{H}\)
CHEMISTRY(KCET)

285560 Which of the following orders is true regarding the acidic nature of phenol?

1 Phenol\(>\) o-cresol \(>0\)-nitrophenol
2 \(o\)-Cresol \(<\) phenol \(<\mathrm{O}\)-nitrophenol
3 Phenol\(<\) o-cresol \(>0\)-nitrophenol
4 Phenol\(
CHEMISTRY(KCET)

285561 Which of the followingcannot be used to oxidize primary alcohols to aldehydes?

1 \(\mathrm{CrO}_3\) in anhydrous medium
2 Pyridinium chlorochromate
3 \(\mathrm{KMnO}_4\) in acidic medium
4 Heating in presence of Cu at 573 K
CHEMISTRY(KCET)

285562 The products formed during the following reaction are

Ans:a
Exp:(a) When one of the alkyl groups is tertiary, the alkyl halide is formed from the tertiary alkyl group.
This is due to the reason that the reaction occurs by \(\mathrm{S}_{\mathrm{N}} 1\) mechanism and the formation of products is controlled by the stability of the carbocation resulting from the cleavage of \(\mathrm{C}-\mathrm{O}\) bond in protonated ether (oxonium ion). Since a tert-butyl carbocation is more stable than methyl carbocation, therefore, cleavage of \(\mathrm{C}-\mathrm{O}\) bond gives methyl alcohol and the more stable tert-butyl carbocation. This carbocation then reacts with \(\mathrm{I}^{-}\)ion to form tert-butyl iodide.

CHEMISTRY(KCET)

285563 In the reaction:

\(\begin{aligned}
\text { Ethanol } \xrightarrow{\mathrm{PCl}_5} X \xrightarrow{\text { alc. } \mathrm{KOH}} Y \\
\qquad \xrightarrow[\mathrm{H}_2 \mathrm{O}, \Delta]{\mathrm{H}_2 \mathrm{SO}_4 \text {, Room temp. }} Z
\end{aligned}\)
the product \(Z\) is

1 \(\mathrm{C}_2 \mathrm{H}_4\)
2 \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OCH}_2 \mathrm{CH}_3\)
3 \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OSO}_3 \mathrm{H}\)