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Standard XII

Chemistry

Dehydration of Alcohols

The molecular...

Question

The molecular formula of acetaldehyde semicarbazone is :

C H_{3} - C H = N - C O - N H - N H_{2}

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C H_{3} - C H = N - N H - C O N H_{2}

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C H_{3} - C H = N - O H

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C H_{3} - C H = N - N H_{2}

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Solution

The correct option is C $C H_{3} - C H = N - N H - C O N H_{2}$
The molecular formula of acetaldehyde semicarbazone is $C H_{3} - C H = N - N H - C O N H_{2}$ .
It is obtained by the reaction between acetaldehyde $C H_{3} C H O$ and semi carbazide $H_{2} N - N H - C O N H_{2}$ .
Its structure is as shown.

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Similar questions

Q. In the given example B,C and B,D are :

(a)

C H_{3} - C H_{2} - C H_{2} - C H_{2} N H_{2}

Butanamine

(1^{o})

(b)

C H_{3} - C H_{2} - N H_{2} | C H - C H_{3}

Butan-2-amine

(1^{o})

(c)

C H_{3} - C H_{3} | C H - C H_{2} - N H_{2}

2-Methylpropanamine

(1^{o})

(d)

C H_{3} - C H_{3} | C | - C H_{3} N H_{2}

2-methylpropan-2-amine

(1^{o})

(e)

C H_{3} - C H_{2} - C H_{2} - N H - C H_{3}

N-methylpropanamine

(2^{o})

Q. In the given compound A,C and A,D are exbhits which of the following isomerism :

(a)

C H_{3} - C H_{2} - C H_{2} - C H_{2} N H_{2}

Butanamine

(1^{o})

(b)

C H_{3} - C H_{2} - N H_{2} | C H - C H_{3}

Butan-2-amine

(1^{o})

(c)

C H_{3} - C H_{3} | C H - C H_{2} - N H_{2}

2-Methylpropanamine

(1^{o})

(d)

C H_{3} - C H_{3} | C | - C H_{3} N H_{2}

2-methylpropan-2-amine

(1^{o})

(e)

C H_{3} - C H_{2} - C H_{2} - N H - C H_{3}

N-methylpropanamine

(2^{o})

Q. Which of the following lone-pair indicated is not involved in resonance?
(A)

C H_{2} = C H - . . N H - C H_{3}

(B)

C H_{2} = C H - . . O . . - C H_{3}

(C)

C H_{2} = C H - . . O . . - C H = C H_{2}

(D)

C H_{2} = C H - N H_{2}

(e)

C H_{3} - C H_{2} - C H_{2} - N H - C H_{3}

N-Methylpropanamine

(2^{o})

(f)

C H_{3} - C H_{2} N H - C H_{2} C H_{3}

N-Ethylethanamine

(2^{o})

(g)

C H_{3} - C H_{3} | C H - N H - C H_{3}

N-Methylpropan-2-amine

(2^{o})

(h)

C H_{3} - C H_{2} - C H_{3} | N - C H_{3}

N, N-Dimethylethanamine

(3^{o})

In the given compound E,F and F,G are :

C H_{3} - C | H C H_{3} - P h | C H - N H_{2}

The IUPAC name of the compound is :

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The molecular formula of acetaldehyde semicarbazone is :

The correct option is C CH3−CH=N−NH−CONH2The molecular formula of acetaldehyde semicarbazone is CH3−CH=N−NH−CONH2.It is obtained by the reaction between acetaldehyde CH3CHO and semi carbazide H2N−NH−CONH2.Its structure is as shown.