Acetaldehyde and acetophenone can be separated from their mixture by using the reagent.

a. NaOH + I₂

b. 2, 4 - DNPH

c. NaHSO₃

d. NH₂-NH₂

Ans: c

C₆H₅CH₂-CHO and C₆H₅CHO can be distinguished by,

a. Iodoform test

b. Tollen’s test

c. 2, 4-DNP

d. Fehling test

Ans: d

Which of the following is used to convert  = C =O group to -CH₂- ?

1. Ni/H₂/△
2. LiAlH₄/△
3. Zn-Hg/HCI/△
4. Pd/H₂/△

Ans: c

Which of the following compounds gives positive Tollen's test as well as lodoform test?

1. Propanone
2. Ethanal
3. Ethanol
4. Methanal

Ans: c

Formation of cyanohydrin from acetone is an example of:

1. electrophilic substitution
2. electrophilic addition
3. nucleophilic addition
4. nucleophilic substitution

Ans: c

Which of the following compound gives iodoform test?

1. propanone
2. propanal
3. butanal
4. butanol

Ans: a

An alkene C₇H₁₄ on ozonolysis gives an aldehyde with formula C₃H₆O and ketone. The ketone is

1. Propanone
2. Butan-2-one
3. Pentan-2-one
4. Pentan-3-one

Ans: b

\(\begin{array}{ccccc}\mathrm{Aetone}&\xrightarrow{{\mathrm{NH}}_4\mathrm{OH}}&\left(\mathrm X\right)&\xrightarrow{{\mathrm{LiAlH}}_4}&\left(\mathrm Y\right)\end{array}\)

in this reaction, the compound (Y) is:

1. tertiary amine
2. secondary amine
3. primary amine
4. 2-amine propane

Ans: d

An organic compound (P) undergoes reduction with LiAlH₄ to produce (Q). When (Q) is heated with copper at 300° C, (P) is again produced. The compound (P) is

1. CH₃-CHO
2. CH₃-CO-CH₃
3. CH₃CH₂-OH
4. CH₃OCH₃

Ans: a