Structural and Physical Properties of Carbonyls

Q.

What is the order of stability of carbanion?

Q. Formalin is :

1. a solution of fructose
2. 40$\%$ aq. solution of formaldehyde
3. a dilute sucrose solution
4. none of the above

Q. A carbonyl double bond is than an alkene double bond.

1. stronger
2. weaker
3. longer
4. less polar

Q. An organic compound X with molecular formula $C_5{H}_{10}O$ gives test with phenyl hydrazine but gives a negative response to iodoform test and Tollen’s test. It produces n-pentane on reduction. The compound could be

1. pentanal
2. pentan-2-one
3. pentan-3-one
4. amyl alcohol

Q. Which of the following carbonyl oxygens will form the strongest hydrogen bond with $H_{2}O$ molecules?

1. 
2. 
3. 
4. 

Q. Among the following compounds, the most acidic is

1. p-nitrophenol
2. p-hydroxybenzoic acid
3. o-hydroxybenzoic acid
4. p-toluic acid

Q. Compound A, $C_8{H}_{10}O$, is found to react with $NaOI$ (produced by reacting Y with $NaOH$) and yields a yellow precipitate with a characteristic smell.
A and Y are respectively:

1. 
2. 
3. 
4. 

Q.

Identify the correct order of boiling points of the following compounds.

1. $C{H}_3(C{H}_2{)}_{2}C{H}_{2}OH$
2. $C{H}_3(C{H}_2{)}_{2}CHO$
3. $C{H}_3(C{H}_2{)}_{2}COOH$

1. $1>2>3$
2. $3>1>2$
3. $1>3>2$
4. $3>2>1$

Q. Arrange in the compounds in their decreasing order of boiling point.

1. Methoxyethane
2. Acetone
3. n-Butanol
4. Butane

Q. If aldehyde and ketone both are present in a molecule, the priority is decided by the aldehyde group.

1. True
2. False

Q. If aldehyde and ketone both are present in a molecule, the priority is decided by the aldehyde group.

1. True
2. False

Q. Match the following:
$\begin{array}{cccc}& \text{Column-I}& & \text{Column-II}\\ \text{i.}& \text{Benzaldehyde}& \text{p.}& \text{Positive Iodoform Test}\\ \text{ii.}& \text{Acetaldehyde}& \text{q.}& \text{Reduces Fehling’s Solution}\\ \text{iii.}& \text{Formaldehyde}& \text{r.}& \text{Positive Tollen’s Test}\\ \text{iv.}& \text{3-hydroxybutan-2-one}& \text{s.}& \text{Positive 2, 4-DNP test}\end{array}$

1. $i-r,s;$ $ii-p,q,r,s;$ $iii-q,r;$ $iv-p,q,r,s$
2. $i-r,s;$ $ii-p,q,r,s;$ $iii-q,r;$ $iv-p,r,s$
3. $i-q,r,s;$ $ii-p,q,r,s;$ $iii-q,s;$ $iv-p,q,r,s$
4. $i-q,s;$ $ii-p,r,s;$ $iii-p,r;$ $iv-p,q,r,s$

Q. Which of the following carbonyl oxygens will form the strongest hydrogen bond with $H_{2}O$ molecules?

1. 
2. 
3. 
4.