I. Alkanlar bobi. Alkanlarning nomenklaturasi

3. Kreking.
1. Alkanlarning kreking jarayonini quyidagi tenglama bilan ifodalanadi:

C_nH_2n+2 → C_mH_2m+2 + C_pH_2p n=6 bo’lsa, m va p lar qanday qiymatlarga ega bo’lishi mumkin?

A) m = 1,2,3,4; p = 5,4,3,2

B) m = 1,2,4,5; p = 5,4,2,1

C) m = 2,4,5,6; p = 4,2,1,6

D) m = 1,3,4,5; p = 5,3,2,1

E) m = 2,3,4,5; p = 4,3,2,1

2. Alkanlarning kreking jarayonini quyidagi tenglama bilan ifodalash mumkin:

C_nH_2n+2 → C_mH_2m+2 + C_pH_2p Agar n=4 bo’lsa, kreking natijasida qanday uglevodorodlar hosil bo’lishi mumkin?

A) metan, propen, etan, etilen B) etan, propen, butin, metan

C) metan, etan, propen, penten D) etan, propen, buten, etilen

E) metan, propen, etan, propan

3. Butanni krekingi natijasida necha xil organik modda hosil bo’ladi? (degidrogenlash hodisasini hisobga olmang).

A) 6 B) 5 C) 4 D) 3 E) 2

4. Alkanlarning kreking jarayoni quyidagi tenglama bilan ifodalash mumkin:

C_nH_2n+2 → C_mH_2m+2 + C_pH_2p. Agar n=6 bo`lsa, tenglamadagi m va p lar qanday qiymatlarga ega bo`lishi mumkin?

A) m = 1,2,3,4; p = 5,4,3,2

B) m = 1,2,4,5; p = 5,4,2,1

C) m = 2,4,5,6; p = 4,2,1,6

D) m = 1,3,4,5; p = 5,3,2,1

E) m = 2,3,4,5; p = 4,3,2,1

5. Alkanlarning kreking jarayoni quyidagi tenglama bilan ifodalanadi: CnH_m+2 → C_mH_{2 m+2} + C_pH_2p. Agar n = 5 bo`lsa m va p larni toping.

A) m = 1,2; p = 4,3 B) m = 2,1; p = 3,4

C) m = 3,4; p = 1,2 D) m = 1,3; p = 4,3

E) m = 1,3; p = 4,5

6. Alkanlarning kreking jarayoni quyidagi tenglama bilan ifodalanadi: CnH_2n+2 → C_mH_{2 m+2} + C_pH_2p. Agar n = 7 bo`lsa m va p larni toping.

A) m = 2,3,4,5,6; p = 6,5,4,3,2

B) m = 1,2,3,4,5; p = 6,5,4,3,2

C) m = 1,2,3,4,5; p = 6,5,4,3,1

D) m = 1,2,3,4,5; p = 6,5,4,3,3

E) m = 1,2,3,4,5; p = 6,5,3,4,1

7. Alkanlarning kreking jarayoni quyidagi tenglama bilan ifodalanadi: CnH_2n+2 → CmH_{2 m+2} + C_pH_2p. Agar n = 8 bo`lsa m va p larni qiymatlarini toping.

A) m = 1,2,3,4,5,6; p = 7,6,5,4,3,2

B) m = 2,3,4,5,6; p = 6,5,4,3,2

C) m = 2,3,4,1,6,7; p = 7,6,5,4,3,2

D) m = 1,2,3,4,5; p = 6,5,4,3,2

8. Alkanlarning kreking jarayoni quyidagi tenglama bilan ifodalanadi: CnH_2n+2 → C_mH_{2 m+2} + C_pH_2p bo`lsa n = 9 bo`lsa m va p larni qiymatini aniqlang.

A) m = 1,2,3,4,5,6,7; p = 8,7,6,5,4,3,2 B) m = 1,2,3,4,5,6,7; p = 8,7,6,5,4,3

C) m = 1,2,3,4,5,6,7; p = 8,7,6,4,3,2

D) m = 1,2,3,4,5,6,7; p = 7,6,4,3,2

9. Alkanlarning kreking jarayoni quyidagi tenglama bilan ifodalanadi: C_nH_2n+2 → C_mH_2m+2 + C_pH_2p bo`lsa n = 10 bo`lganda m va p larni aniqlang.

A) m = 1,2,3,4,5,6,7,8; p = 9,8,7,6,5,4,3,2

B) m = 2,3,4,5,6,7,8; p = 8,7,6,5,4,3,2

C) m = 1,2,3,4,5,6,7; p = 9,8,7,6,5,4,3

D) m = 1,2,3,4,5,6,7; p = 8,7,6,5,4,3,2

10. Pentanni krekinglab olingan alkan va alkenlarning umumiy soni nechta?

A) 4 B) 6 C) 8 D) 10

11. Geptanni krekinglab olingan alkan va alkenlarning umumiy soni nechta?

A) 4 B) 6 C) 8 D) 10

12. Oktanni krekinglab olingan alkan va alkenlarning mol nisbati qanday bo`ladi.

A) 1: 2 B) 2:1 C) 1:1 D) 3:1

13. Dekanni krekinglanganda olinadigan alkan va alkenlarning umumiy soni nechta?

A) 12 B) 14 C) 16 D) 18

14. Oktanni krekinglanganda hosil bo`lgan aralashma tarkibidagi barcha alkenlarning hajmiy ulushi yig`indisini hisoblang.

A) 20 B) 40 C) 60 D) 50

15. Uglevodorod termik krekinglanganda olingan alkan va alkenlarning umumiy mol miqdori 12 ga teng bo`lsa, uglevodorodni aniqlang.

A) geptan B) oktan C) nonan D) dekan