6. ⇒ (MHT CET 2021 21th September Morning Shift )

Which from following reactions converts carbonyl group of aldehydes and ketones to methylene group on treatment with zinc amalgam and concentrated $HCl$ ?

A. Wolf-Kishner reaction

B. Stephen reduction

C. Clemmensen reduction

D. Rosenmund reduction

Correct Option is (C)

Clemmensen reduction

MHT CET 2021 21th September Morning Shift Chemistry - Aldehyde and Ketone Question 18 English Explanation

7. ⇒ (MHT CET 2021 20th September Evening Shift )

Identify the product formed in the following reaction,

${CH}_{3} - CH = CH - {CH}_{2} - CHO ⟶_{(ii) H_{2} O^{+}}^{(i) LiAl H_{4}} Products$

A. ${CH}_{3} - CH = CH - {CH}_{2} - OH$

B. ${CH}_{3} - {({CH}_{2})}_{3} - {CH}_{2} - OH$

C. ${CH}_{3} - CH - CH = CH - {CH}_{2} - OH$

D. ${CH}_{3} - CH = CH - {CH}_{2} - {CH}_{2} - OH$

Correct Option is (D)

${CH}_{3} - CH = CH - {CH}_{2} - CHO ⟶_{(ii) H_{2} O^{+}}^{(i) LiAl H_{4}}$ ${CH}_{3} - CH = CH - {CH}_{2} - {CH}_{2} - OH$

LiAlH $_{4}$ does not reduce the isolated olefinic bond and hence it can reduce unsaturated aldehydes and ketones to unsaturated alcohols.

8. ⇒ (MHT CET 2021 20th September Morning Shift )

Which of the following compounds on reaction with Grignard reagent followed by hydrolysis forms secondary alcohol?

A. CH $_{3}$ CHO

B. HCHO

C. CH $_{3}$ CH $_{2}$ COCH $_{3}$

D. CH $_{3}$ COCH $_{3}$

Correct Option is (A)

Aldehydes (except formaldehyde) on reaction with Grignard reagent followed by hydrolysis forms secondary alcohol.

$∴$ CH $_{3}$ CHO forms secondary alcohol.

⇒Aldehydes, Ketones and Carboxylic Acids